HARLEM (WABC) -- The NYPD has released a still photo of a man wanted for questioning in the deadly fire that killed an MTA worker on Friday.
Police believe the fire on a northbound train near the 110th Street/Lenox Avenue station is the latest from a serial arsonist.
16 others were injured after flames erupted inside a subway train in Harlem at 3:18 a.m. Friday at the 110th Street Subway Station at Lenox Avenue.
MTA motorman Garrett Goble, 36, was pronounced dead at St Luke's Hospital.
Four others were in serious condition.
Another 12 people were treated for minor injuries, including five firefighters.
Garrett's wife does not doubt that her husband died, helping others get off the train.
Delilah last spoke with her husband 2 hours before the 36-year-old was killed. Several hours later, she sent him this text because she had heard about the fire on and was worried. Delilah never heard back.
"The way he lost his life is how he lived his life, he would help anyone," said Delilah.
Delilah says it breaks her heart, telling her son Noah that his best friend is now gone.
"I feel like I'm in a dream, and I can't get up, I have two kids, and I tell myself I have to be strong, deal with my son's pain before my own," said Delilah.
A person of interest was questioned Friday but released by the NYPD.
"There are other fires that we are looking at, we have to see if they are connected to this, 86th street and 96th street, within the transit system," said NYPD Deputy Chief Brian McGee. "We're also looking at a fire on 116th Street as we speak. The most important thing I need is witnesses to come forward, 800-577-TIPS."
The MTA has issued a $50,000 reward for information that leads to an arrest.