New York City police announced Sunday they have in custody a person of interest in the early morning death of a woman who they believe may have fallen asleep on a stationary subway train before being intentionally lit on fire by a man she didn't know.Transit police apprehended the suspect after receiving a report from three high school students who had recognized the man. They had seen images of the suspect taken from surveillance and police body cam video and widely distributed by police.New Yorkers came through again, said New York City Police Commissioner Jessica Tisch, who described the case as one of the most depraved crimes one person could possibly commit against another human being.RELATED STORY | Former Marine acquitted in NYC subway chokehold death trialTisch said the suspect and the woman, both of whom have not been identified, were riding a subway train without any interaction between them to the end of the line in Brooklyn at around 7:30 a.m.After the train came to a stop, surveillance video from the subway car showed the man calmly walk up to the victim, who was seated motionless, possibly sleeping, and set her clothing on fire with what appeared to be a lighter. The woman's clothing then became fully engulfed in a matter of seconds, Tisch said.Police do not believe the two knew one another.Officers on a routine patrol at the Coney Island-Stillwell Avenue subway station smelled and saw smoke and discovered the woman on fire, standing in the middle of the subway car. After the fire was extinguished, emergency medical personnel declared the woman dead at the scene.RELATED STORY | Luigi Mangione pleads not guilty to state charges in killing of UnitedHealthcare CEOUnbeknownst to the officers, the suspect had remained at the scene and was seated on a bench on the subway platform, just outside the train car, Tisch said. Body cameras worn by the officers caught a very clear, detailed look at the suspect and those images were publicly disseminated.After later receiving a 911 call from the teenagers, other transit officers identified the man on another subway train and radioed ahead to the next station, where more officers kept the train doors closed, searched each car and ultimately apprehended him without incident, said Chief of Transit Joseph Gulotta. The man had a lighter in his pocket when he was taken into custody, Tisch said.Gulotta said the investigation was continuing, including whether the woman was homeless and the background of the suspect.The case marked the second fatality on a New York subway Sunday.At 12:35 a.m., police responded to an emergency call for an assault in progress at the 61st Street-Woodside Station in Queens and found a 37-year-old man with a stab wound to his torso and a 26-year-old man with multiple slashes throughout his body. The older man was pronounced dead at a nearby hospital while the younger man was in stable condition, police said.An investigation was continuing.New York Gov. Kathy Hochul this year has sent New York National Guard members to the city's subway system to help police conduct random searches of riders bags for weapons following a series of high-profile crimes on city trains. Hochul recently deployed additional members to help patrol during the holiday season.About a year ago, Hochul supported funding to install video cameras on every train car in the New York subway system, said Michael Kemper, chief security officer for the Metropolitan Transportation Authority. He and other officials on Sunday credited the cameras with helping to track down the suspect so quickly.