A woman was stabbed to death inside her Chinatown apartment early Sunday, Feb. 13, after her alleged killer followed her home.

Surveillance footage shows her final moments. In the video, the suspect is seen tailing the 35-year-old victim on the street as she enters her Chrystie Street apartment building.

He follows close behind as she opens the front door and strolls into the hallway.

Minutes later, a neighbor across the hallway of the victim’s sixth-floor apartment at 111 Chrystie Street called 911 around 4:30 a.m. after hearing her screams during the brutal stabbing, law-enforcement sources said.

“We’ve got cameras on every floor and in the front here,” the owner of the building said. “She got out of a cab right here and he followed her. He grabbed the front door just before it closed. He followed her all the way up, hanging back, staying one floor behind her all the way up to the sixth floor.

“Then, he waited until her door was just about to close and he went in.”

The victim, whose name is being withheld by The Post pending family notification, was found in her bathtub “bleeding from multiple wounds to the body,” according to a source and an NYPD spokesman.

“So much blood,” the building’s owner said. “My wife said I should call someone to clean all the blood but I’m going to clean it up myself. It’s the least I can do for that poor girl.”

Cops who responded to the 911 call allegedly found the suspect, identified by sources as Assamad Nash, 25, inside the apartment and covered in blood. Nash allegedly tried to flee the grisly scene via the fire escape before barricading himself inside — prompting the NYPD’s Emergency Service Unit to bust down the door, according to sources.

“There was a male inside refusing to exit the apartment,” a police spokesman said Sunday.FDNY medics pronounced the victim dead at 5:55 a.m.

Sources said Nash, 25, is a homeless career criminal with three open cases and a record of several escapes from police custody.

The victim, who was Asian, was a digital producer and previously lived in New Jersey, sources and neighbors said. 

“She’s from New Jersey, been here less than a year,” the building’s owner said Sunday. “Such a sweet girl.”

Police are investigating whether the slaying was a hate crime.

“It’s all under investigation,” an NYPD spokeswoman said.