The viewing will be held from 2 p.m. to 9 p.m. on Monday at St. Paraskevi Greek Orthodox Shrine Church, located at 1 Shrine Place in Greenlawn.
Funeral services will be held at 10 a.m. Tuesday, also at the church.
A GoFundMe for the family has raised more than $115,000, while a separate fundraiser set up by Fund the Finest, which raises money for police and military families, has raised more than $45,000.
Tsakos, a 14-year veteran of the force, leaves behind his wife, a 6-year-old daughter and a 3-year-old son.
"He didn't deserve this," brother Teddy Tsakos told Eyewitness News. "He just bought a house. He was starting his life. He was doing good. Everything was cut short. That's it."
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Tsakos was diverting cars off the highway after a previous fatal crash when he was struck by 32-yea-old Jessica Beauvais, who police say admitted to drinking wine, vodka and tequila before getting behind the wheel.
She is now facing 13 criminal charges and both confessed and apologized as she was walked out of the police precinct.
"I'm sorry," she said tearfully. "I'm sorry that I hit him and that he's dead."
Those who knew the officer were stunned by the news.
"I just can't believe it," neighbor Ruth Mandera said. "It's shocking. I've been crying ever since I heard."
Tsakos and his family had just moved to their East Northport neighborhood and made a quick impression on their neighbors. .
"Family man, friendly as can be, and the most hardworking person you'd ever want to meet," neighbor Moyra Bletsch said.
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