Police are hunting for the man last seen with a Citigroup banker whose body was found with his throat slit in the tub at his Financial District condo, sources said Wednesday.

Surveillance video from the Greenwich Street building shows Shawn Miller, 41, and another man together in the elevator Monday at around 6:30 p.m. The unknown man later left the apartment building alone – but Miller never did, the sources said.

The man from the surveillance video is not considered a suspect, but cops want to question him about the death. Investigators have not determined whether it was a suicide or a homicide.

The doorman who found Miller’s body, Tommy Perez, told investigators that he went to the victim’s apartment Tuesday afternoon after receiving a call from a concerned man who claimed to be the banker’s Canadian boyfriend, the sources said.

Perez found Miller’s body in the tub with his throat cut.

The last time the boyfriend spoke to Miller was on the phone at 7:11 p.m. Monday, the sources said, while the banker was home with the mystery man.

Police have not yet found the weapon used to cut Miller’s throat.

A top banker at Citigroup, Miller worked as the bank’s managing director of environmental and social risk management.

Click here for more from the New York Post.