Two young men believed to be witnesses to two murders were executed in a parked SUV after a night of partying in Manhattan's Flatiron District.
Rashawn Washington, 26, and Terrance Serrano, 22, both of Coney Island, were each shot in the head moments after leaving the E. 19th St. hot spot Roam.
The motive behind the double rubout was unclear.
Detectives had questioned Washington about the 2009 stray-bullet killing of a Coney Island grandmother, and Serrano was quizzed about his brother's murder last year.
Neither agreed to cooperate, cop sources said.
Investigators believe the duo may have gotten into a beef inside the club. They both had rap sheets and a long list of potential enemies.
"Both are known gang-bangers who are involved in many things, and their business is likely behind their execution - not the fact that they were potential witnesses in other homicides," a law enforcement source said.
Police Commissioner Raymond Kelly said security-camera footage shows a dark sedan pull up behind the victims' silver SUV on E. 19th St. between Park Ave. and Broadway.
Two men hopped out of the sedan and approached the SUV before disappearing from view. Seconds later, they were seen running back and zooming away.
"I heard a series of shots. 'Boom! Boom!' Pause. Then 'Boom! Boom! Boom!'" said Glenn Steigelman, 61, who lives around the corner.
"I looked at my clock: It was 3:45 [a.m.]. I tried to look out the window and I heard a car screech and speed down the street, like it was trying to get away really fast."
Hours before his death, Serrano had posted on Twitter about the possibility of dying young. His page also included a reference to enemies attending his funeral.
"And @ my Funeral it's only one wish: I ask give da haters a chance 2 see me cause it's dey last [chance] - and 1 by 1 turn me over let em kiss my a--."
Darnell Simms, 23, a friend of Washington and Serrano said "they were two people that always looked out for everyone in the hood, and they always were a positive crowd to be around."
Washington had 11 arrests on his record, including busts for gun possession.
Investigators believe he was on the scene during a daylight gun battle that led to the stray-bullet killing of Anna Surman, 87, in August 2009.
The Coney Island grandmother was walking in the flower-filled courtyard of the Surfside Houses when she was struck in the neck.
Her killer is at large, and investigators believe Washington knew where the shot came from - but he wouldn't tell them.
Serrano had seven prior collars, including arrests for gun possession and robbery, police sources said.
He was targeted in a July 2009 shooting on Surf Ave. The bullet hit his brother, Micuan Serrano, 19, in the face, killing him.
Serrano also was of no help to investigators, who are still trying to track down his brother's killer.
