The NYPD 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.

The suspect is a migrant from Guatemala. Sources identified the person of interest to YWN as 33-year-old Sebastin Zapeta, saying he entered the U.S. from Guatemala approximately a year ago, but whether he did so legally or illegally was unclear.

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.”

Tisch 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.

Unbeknownst 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.