BED-STUY, Brooklyn (PIX11) — The search is on for the man who fatally stabbed Ryan Carson, who dedicated his life to fighting for social justice.

The 32-year-old was waiting for a bus with his girlfriend when police said he was brutally attacked. Surveillance video obtained by PIX11 News showed an unidentified man, who police described as emotionally disturbed, stabbing Carson several times.

The attack happened early Monday morning at the intersection of Malcolm X Boulevard and Lafayette Avenue in Bedford-Stuyvesant, Brooklyn, police said. Carson and his girlfriend were on their way home from a wedding.

Carson was taken to a hospital, where he died from his injuries. His roommates said it could have happened to anyone at any time.

The New York Public Interest Research Group, where Carson had worked, released a statement on Tuesday: “Ryan was a beloved staffer, colleague and friend, and a creative, talented, relentless and upbeat advocate for students and the environment.”

In a GoFundMe video, Carson was seen raising awareness for overdose prevention — something his roommates said was another passion of his.

“He did a campaign where he walked from this stoop here in Brooklyn to Buffalo,” a roommate told PIX11 News. “He completely dedicated his life to other people.”

Submit tips to police by calling Crime Stoppers at 1-800-577-TIPS (8477), visiting, downloading the NYPD Crime Stoppers mobile app, or texting 274637 (CRIMES) then entering TIP577. Spanish-speaking callers are asked to dial 1-888-57-PISTA (74782).