According to police reports, Membreno rounded up friends Gabriel Dos Santos, 24, and a third man, whom police say it is still large, and they went looking for 20-year-old Manos Ikonomidis. The gang of three found the victim leaving the apartment where the girlfriend had the steamy threesome ‘rape’ escapade.
“I just wanted some f***ing justice,” Membreno said at Rikers Island. “I wanted to hold him until the police got there.”
But cops say Membreno and his posse set upon Ikonomidis with bats and knives, leaving him to die in a pool of blood in the hallway of the building before taking off.
Membreno claims he was high at the time and doesn’t remember many details of the murder.
“He was fighting me. I had to defend myself. I had to fight back,” he said.
Police say there is no evidence the victim was ever on the offensive.

The fleeing Ikonomidis made it to the main floor hallway of the apartment building and , got to knock on the door of one of the apartments before collapsing.
“They stabbed me! They stabbed me twice! They stabbed me!” he told the stranger who answered the door. “I’m so sorry.”
The woman who answered the door said it was not until EMTs arrived and turned him over that she realized the extent of his injuries. A pale Ikonomidis had  four stab wounds in his chest and back, and he had been savagely beaten with baseball bats.
Detectives believe that Membreno’s girlfriend, Ikonomidis and 21-year-old Jack Doherty were involved in a consensual threesome inside Doherty’s Park Slope pad before the killing.
The rendezvous ended abruptly, but only because the woman became upset when Ikonomidis started filming the sexcapades, cops said.
Soon after, Ikonomidis’ girlfriend — who was not involved in the sex play — received an ominous Instagram message reading “your boyfriend f—-d up and will be taken care of,” sources said.
Authorities last week said they were still trying to piece together exactly what happened during the doomed fling in Doherty’s apartment.
“We have a competing narrative in this case,” NYPD chief detective Boyce said. “We’re still trying to decipher exactly what happened that day.”
For Membreno the burning question is: “Did she set me up? I deserve to know the truth,” he enquired.
He also said he hasn’t spoken to his girlfriend since being locked up.
“This is my life now,” he said, ripping open his beige jail jumpsuit and grabbing it in his fist. “I can’t do it anymore. I really don’t know what I have to live for.”

One of Membreno’s co-defendants, Gabriel Dos Santos, 24, is also being held at Rikers Island. He’s charged with murder, weapons possession, gang assault and burglary, cops said Saturday.
Maria Ramos recounting events of the night said her son, Dos Santos, who became a dad  five months ago, was in bed when Membreno called saying his girlfriend had been gang-raped and he needed backup to confront the alleged perpetrator.
“He say, ‘I have to leave because Chris need me,’” Ramos recalled. “I said, ‘Don’t go. I have a feeling there’s going to be trouble.’ He said he has to. Chris is his friend.”
Dos Santos seemed calm when he returned home about an hour later. But he freaked out after getting a call from Membreno saying the man they assaulted was dead, his mother said. “He said, ‘I had no idea Chris had a knife,’” Ramos said. “He said when he saw that, he started panicking.”
Cops are still searching for a third man they believe took part in the fatal mayhem.
Membreno, facing murder and criminal possession of a weapon charges, said he harbors no ill will against his girlfriend.
“I still love her even though she set me up,” he said. “I don’t know why I still love her.
“I just want some answers,” he added.
Detectives have not determined whether or not Membreno’s flame will face any charges.
“She has not been charged at this point with anything,” said a high-ranking police source, who noted that charges may never come. “Lying to your boyfriend is not the same as, say, lying to the police.”