The family of an unarmed teenager who was shot and killed in 2012 by an NYPD officer in his Bronx home held a vigil outside the office of the U.S. Attorney for the Southern District last night. February 2nd marked four years since Ramarley Graham’s death, and more than a year since U.S Attorney Preet Bharara’s office told Graham's family they were investigating the slaying. Yet Bharara’s office, which has basked in the triumphs of successfully prosecuting corrupt state legislators and Wall Street titans, has remained silent on Graham’s case.

"I always told my kids I'll stand up for what I believe in,” Ramarley's mother, Constance Malcolm, told the crowd. “If I give up now I'm lying, and I'm not gonna lie to my kids. So I'm gonna fight to the end of my life."

Meanwhile, Officer Richard Haste, who killed Graham in his apartment in front of his grandmother and six-year old brother, continues to be employed by the NYPD, and recently received a $25,000 salary increase.

While Haste was originally indicted by a Bronx grand jury on two counts of manslaughter, the case was later thrown out due to a technicality. Another grand jury declined to indict Haste, who testified that he shot Graham in his bathroom because he thought he had a weapon. No gun was found, and investigators believe that Graham was dumping a small bag of marijuana into the toilet. Graham's family filed a lawsuit against the NYPD, which the City settled last year for $3.9 million.

At yesterday’s vigil, Graham’s parents, Constance Malcolm and Frank Graham, were joined by Eric Garner’s mother, along with the mothers of Kimani Gray and Sean Bell. White balloons, battery-operated candles and knit caps were handed around to the participants, many of whom planned to spend the night outside. By 7 p.m., the crowd, some of whom had attended a rally outside City Hall earlier in the day, had swelled to more than 200.

Proud of my friends @changethenypd who slept out last night for justice for #RamarleyGraham. #RiseUp4Ramarley pic.twitter.com/kXR4XNFVHJ — Brad Lander (@bradlander) February 3, 2016

"We want to send a message to the NYPD that we will not tolerate lawlessness," Frank Graham said.

One 21-year-old protester named Darian X said he planned on sleeping outside the U.S. Attorney’s office.

"When I heard about his case ... I immediately felt empathy for him, because I saw myself in him,” X said. “We live in a zeitgeist where a black person is killed every 24 hours."

Constance Malcolm, who works as a nurse’s assistant at an assisted living facility, also planned to spend the night outside.

"I'll be here all night. And then I'll leave to go to work, and I'm working a double shift tomorrow. And then I'll keep coming back," she said.

Preet Bharara’s Office declined to comment on the investigation into Graham’s case.