Horrifying new photos show the gruesome scene inside a Brooklyn subway car where an illegal Guatemalan immigrant allegedly set a sleeping woman on fire and then calmly watched as she burned – later telling police he had no memory of the cruel murder.

Surveillance images captured by MTA cameras in the F car allegedly show Sebastian Zapeta-Calil standing in the mostly empty F car, his hands in his hood pockets as flames engulf the woman.

The alleged victim, who was on the train at the time of the arson, appeared to need a walking aid – the mobility device is clearly visible in the horrifying photos.

A new video of the monstrous murder also appears to show Zapeta-Calil trying to fan the flames with a T-shirt or similar item of clothing as the flames rose to the roof of the subway car.

The suspect was arrested a short time later on another subway — with a lighter in his pocket — and while a clear motive has not yet been determined, sources tell The Post.

Zapeta-Calil later told investigators he was drunk and didn’t remember setting anyone on fire.