A man in Brooklyn murdered his girlfriend and two other men after he caught them having a threesome.

The 50-year-old has admitted he committed the crime and threw the dead bodies of the two men at some place in New Jersey.

"He made statements implicating himself in the deaths," the New York Post quoted NYPD spokesman Paul Browne, as saying.

The convict had found his 51-year-old girlfriend having sex with the two men after midnight in her apartment at 1518 Eastern Parkway in Brownsville.

He later left a voicemail with a friend saying he had killed all three of them.

When cops reached the house, the suspect was found hovering over the woman's dead body in a back bedroom.

However, it has not been confirmed if the three victims were shot or beaten to death.

Regine Nole, a neighbor, said the man "didn't look afraid or upset" when police took him away.

"He just put his head down and went into the police car," Nole said.

Referring to the dead woman, she added: "She was dating more than one guy and just moved into this apartment three weeks ago."

Another neighbour Lulu Facey, said she had heard someone yelling 'Help! Help!'", but had assumed somebody was scared of dogs barking at another apartment. (ANI)