This was the nation's deadliest school shooting since the attack in Newtown, Connecticut, more than five years earlier.
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In the aftermath of the Feb. 14, 2018 shooting, its young survivors sparked a movement against gun violence and inspired advocacy around American gun control. Their efforts lead to nationwide student walkouts and hashtags such as #NeverAgain and #Enough.
The lives lost included a beloved football coach who died shielding students and a junior cadet pointing others to safety when he was shot.
The 17 victims were:
AARON FEIS, 37
Aaron Feis was a beloved security guard and assistant football coach at Marjory Stoneman Douglas, the team wrote on social media. They said he was shot while shielding students from the gunfire.
Feis, who worked mainly with the junior varsity team, was survived by a wife and daughter, according to the school's website. He played football at the school before graduating in 1999 and going straight into coaching there.
Broward County Sheriff Scott Israel called him "a phenomenal man" and "one of the greatest people I knew."
A sophomore football player told the Sun Sentinel that Feis was a great person.
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"Everyone loved him. Shame he had to go like this. Always gave his all to making us better," lineman Gage Gaynor said. "Definitely learned a lot from him."
"He died a hero and he will forever be in our hearts and memories," the football team wrote.
ALYSSA ALHADEFF, 14
Alyssa Alhadeff had dreams of being on the U.S. women's national soccer team, her mom told ABC News last year.
She was described as a "loved and well-respected member of our club and community" by the Parkland Soccer Club.
"Honor Alyssa by doing something fabulous in your life. Don't ever give up and inspire for greatness. Live for Alyssa! Be her voice and breathe for her. Alyssa loved you all forever!" her family said in a statement released by the club.
Her mom, Lori Alhadeff, has since won a seat on the county school board. She said she doesn't want any other parent to go through what she went through.
SCOTT BEIGEL, 35
Scott Beigel was another faculty member who died while trying to help students.
Student Kelsey Friend told "Good Morning America" that when she heard gunshots and realized it wasn't a drill, she followed other students toward the classroom.
Beigel "unlocked the door and let us in," she said. "I thought he was behind me, but he wasn't. When he opened the door he had to relock it so we could stay safe, but he didn't get a chance to."
Student Bruna Oliveda said she saw Beigel blocking the door.
"At orientation, he told us that he was excited to open our eyes to what he saw, having traveled the globe. Sending light and love to his family and loved ones," a former student's parent tweeted after news of Beigel's death broke.
Beigel, a geography teacher and cross-country coach, grew up on Long Island. He also worked as a counselor at Camp Starlight in Pennsylvania and was engaged to a fellow counselor.
MARTIN DUQUE ANGUIANO, 14
Martin Duque Anguiano was one of "the nicest people," said friend Isaac Briones.
Briones said he last saw Anguiano the day of the shooting during first period when they were "just playing around, talking about jokes and stuff."
The freshman and member of the Junior Reserve Officers' Training Corps (JROTC) was a proud son of Mexican immigrants, ABC News reports.
On Instagram, Miguel Duque wrote that words can't describe the pain of losing his brother. He added: "I love brother Martin you'll be missed buddy. I know you're in a better place. Duques forever man I love you junior!!! R.I.P Martin Duque!"
NICHOLAS DWORET, 17
Nicholas Dworet, a senior just shy of turning 18, had committed to swim for the University of Indianapolis.
In a 2018 statement, UIndy swimming coach Jason Hite called Dworet an "energetic and very vibrant kind."
He dreamed of swimming for the U.S. team by the 2020 Olympics, his family said.
"This kid was a dream," his father, Mitch Dworet, told ESPN. "He was the best of us."
JAIME GUTTENBERG, 14
Jaime, a freshman, was an aspiring dancer and gymnast. She always stood up to bullies, her father Fred told the Miami Herald, and she volunteered with a program that helps people with disabilities.
Fred Guttenberg, a 54-year-old real estate agent, has since become an outspoken advocate against gun violence. His group, "Orange Ribbons for Jaime," pushes for a law named for her that would require that purchasers pass a universal background check before buying ammunition.
He recently gained national attention for his outburst during President Donald Trump's State of the Union address by shouting at him to do something about gun violence.
CHRIS HIXON, 49
Chris Hixon, a married father of two, was the school's award-winning athletic director, and he coached wrestling, his passion. Hixon was also a U.S. Navy reservist who was deployed to Iraq in 2007, according to WPLG.
He wasn't shy about jumping in wherever he was needed, said friend and one-time colleague Dianne Sanzari.
When a volleyball team needed a fill-in coach, Hixon took over; the same thing happened with the wrestling team, Sanzari said. When the school needed someone to patrol the campus and monitor threats as a security specialist, Hixon did that, too.
It was in that security role that Hixon apparently came within range of the shooter.
LUKE HOYER, 15
Luke Hoyer, 15, was a sweet person who loved basketball and "smiled all the time," his aunt Joan Cox said.
"He was just a good kid ... very loving and just enjoyed life," said Cox, of Greenville, South Carolina.
She said Luke's parents, Gena and Tom Hoyer, searched for their son at hospitals before finally going to the law enforcement command center, where they eventually learned he had died.
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CARA LOUGHRAN, 14
Cara Loughran was an excellent student who loved the beach and her cousins, according to her family.
She was a member of the Drake School of Irish Dance in South Florida. The organization called her "a beautiful soul" who "always had a smile on her face."
Her aunt, Lindsay Fontana, wrote on Facebook in 2018: "I had to tell my 8-year-old daughters that their sweet cousin Cara was killed in the shooting at Stoneman Douglas High School yesterday. We are absolutely gutted."
"While your thoughts are appreciated, I beg you to DO SOMETHING," she wrote. "This should not have happened to our niece Cara and it cannot happen to other people's families."
GINA MONTALTO, 14
Gina Montalto was a 14-year-old freshman and a part of the winter color guard squad at the school. She was also a Girl Scout, a church volunteer, a soccer player and a great student, according to the Miami Herald.
Her family wrote on a GoFundMe page that Gina also loved cooking, Harry Potter, fashion, "spa days with Mom and NY Jets games with Dad."
After the shooting, her mother, Jennifer Montalto, called her "a smart, loving, caring, and strong girl who brightened any room she entered."
One of Montalto's color guard instructors from middle school, Manuel Miranda, told the Miami Herald that Montalto was "the sweetest soul ever."
JOAQUIN OLIVER, 17
Oliver had spent the night before he died picking out Valentine's Day flowers for his girlfriend, and he spent that morning taking extra time to get dressed for the day.
"His heart was so big," his girlfriend, Victoria Gonzalez, told ABC News after the shooting. "All he did was love everyone."
His father, Manuel Oliver, told ABC News that when he dropped his son off at school that day, he asked Joaquin to call him and let him know how it went giving Victoria the flowers.
"And then he never called me," he said.
The 17-year-old was born in Venezuela and had become a U.S. citizen in 2017.
A big Miami Heat fan, Joaquin was buried in a Dwyane Wade jersey. Wade got emotional when asked about it, saying he hurt for the family and hoped he was able to help them make some memories when Joaquin was alive.
Manuel Oliver started an organization in his son's honor dedicated to empowering the next generation of gun law activists.
ALAINA PETTY, 14
Alaina, another JROTC cadets loved to volunteer and serve others, her family said. The 14-year-old helped rebuild areas of Florida after Hurricane Irma.
"Her selfless service brought peace and joy to those that had lost everything during the storm," her family said in a statement released after the shooting.
Alaina was also a member of The Church of Jesus Christ of Latter-day Saints congregation in Coral Springs.
The Utah-based church lamented in a statement that we "once again we find ourselves as a nation and as communities faced with a tragic loss of life and incomprehensible sorrow" and extended its love to victims and their families.
"We unite our prayers with millions of others who are mourning and praying for them," the church said.
Her father, Ryan Petty, was recently appointed to the Florida Board of Education.
MEADOW POLLACK, 18
Meadow Pollack was a "beautiful girl, inside and out," her cousin, Jake Maisner, told The Sun Sentinel.
He said she was the youngest of 10 grandchildren, which made the family protective of her.
Her father, Andrew, had previously made comments supportive of the president online. During a listening session with the president after the shooting, Andrew had strong words about the importance of school safety.
"All these school shootings, it doesn't make sense. Fix it!" he said. "... We should have fixed it! And I'm pissed. Because my daughter ... She's not here. She's not here. She's in Fort Lauderdale King David cemetery, that is where I go to see my kid now."
Family friend Adam Schachtel said in a Facebook post that "an angel was taken away from us in that horrific tragedy ... no words can be said so just prayers and sadness."
Meadow had plans to attend Lynn University in Boca Raton, a university spokesperson told WPLG.
HELENA RAMSAY, 17
Helena Ramsay was wise beyond her years, shy until you got to know her and discovered she had a wicked wit, her mother said.
Ramsay was described by one classmate as "one of the kindest people I've ever met," according to the Miami Herald.
The 17-year-old junior, who friends said took in two stray cats, also loved music and hanging out with friends and family.
"Although somewhat reserved, she had a relentless motivation towards her academic studies and her soft warm demeanor brought the best out in all who knew her," a relative, Curtis Page Jr., wrote on Facebook in 2018.
ALEX SCHACHTER, 14
Alex had lost his mother when he was just 4, his dad, Max, wrote in his eulogy. Max later remarried, and Alex and his brother gained two sisters. The family moved to Parkland for a new beginning.
Alex played trombone and baritone and was a "sweetheart of a kid," his dad wrote on social media.
In honor of the 14-year-old freshman, Schachter started a scholarship fund "to help other students experience the joys of music as well as fund increased security at schools."
CARMEN SCHENTRUP, 16
Carmen Schentrup was a smart girl with a sweet smile, according to her family. She was a girl of many interests and talents, including reading, art and music. She played three instruments.
Her family said she was a dreamer who was going to change the world.
"We miss seeing her make her dreams come true," her family wrote.
She was excited to start college and wanted to be a medical scientist so she could discover a cure for diseases, such as ALS.
Cousin Matt Brandow posted on Facebook that the 16-year-old had visited Washington state and was considering going to the University of Washington to get repreive from the Florida humidity. She had also been accepted into the Univerisity of Florida honors program.
In September 2017, she was named one of 53 National Merit Scholarship Program semifinalists in the county. A day after she was killed, her parents said, Carmen was named as one of the finalists.
PETER WANG, 15
Peter Wang, a 15-year-old JROTC student at Marjory Stoneman Douglas High School, wasn't interested in status but wanted to help others, relatives said.
Like two of his classmates, Peter was honored with the U.S. Army's Medal of Heroism.
A cousin, Aaron Chen, said that Peter was last seen holding a door open so others could get away from the gunman.
Peter, who dreamed of attending West Point, was wearing his JROTC uniform when he died. West Point posthumously offered him admission.
The Associated Press contributed to this report.