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A threesome in Brooklyn turned deadly Monday after one of the participants began filming the encounter, sparking a brutal attack with baseball bats and knives, police sources said.
The bloodshed in Park Slope left Manos Ikonomidis, 20, dead of three stab wounds in the chest and back.
He collapsed in the first-floor hallway of a building at 16th St. and Seventh Ave., where earlier he’d indulged in the steamy sexcapade with a 21-year-old man and a woman.
"It's something out of a horror movie," stunned building resident Carol Petersen, 37, said. Her 18-year-old daughter had heard the victim screaming.
Police sources said the menage a trois came to an awkward end when one of the guys started filming the tryst, prompting the woman to become upset.
The 21-year-old man — who lived in the apartment where the sex occurred — drove the woman back to her Staten Island home, leaving Ikonomidis alone, sources said.
A resident in the building said that the woman had contacted her boyfriend — who was not involved in the threesome — and alleged she’d been raped.
Ikonomidis’s girlfriend — who was also not involved in the threesome — received an ominous Instagram message reading “your boyfriend f---ed up and will be taken care of,” sources said.
Police sources said cops found no evidence the encounter was nonconsensual.
When the man returned to his apartment, Ikonomidis decided to leave for reasons that were unclear, sources said.
He didn’t get far.
Surveillance cameras captured two white men and a black man chasing Ikonomidis as he tried to leave the building, sources said.
Bleeding from fatal stab wounds, the victim knocked on the door of a nearby apartment and collapsed, leaving bloody handprints.
“He fell into her house, she opened the door ... he was apologizing, 'I'm so sorry. I'm so sorry,’” said a woman in the building whose relative opened the door. “He says, 'They hit me in the head, they hit my head with a bat.' She said there was so much blood just gushing out of him.”
Ikonomidis pleaded with the woman not to call 911.
He went to stand up, I don't know if he was gonna try and leave or what, (and) collapsed on the floor,” the woman said. “She said his whole body started jerking and then they came, he barely had a pulse.”
Ikonomidis died at Methodist Hospital in Brooklyn at 4:33 a.m.
Ikonomidis’s girlfriend arrived at the crime scene hours after the killing.

"Oh my God, no! My baby, it can't be f---ing real!” she cried.
"(Why) didn't you go home? Why didn't you listen to me? ... He better go to f---ing jail! (Will) you guys get him please? ... My baby, my baby, I love you so much.”
Residents at the building had to hop over a blood-stained rug in the hall. Police took an aluminum baseball bat labeled “Magnum” into evidence.
Police were questioning the 21-year-old man, who was not considered a suspect in the slaying. No suspects were in custody, sources said.
Man stabbed to death after threesome in Brooklyn turns violent