DNA evidence recovered from a bandanna that a purported gang member was wearing and dropped after he shot and killed a 64-year-old man four years ago helped lead to his arrest on murder charges this week, Cook County prosecutors said Friday.

Anthony Wells, who is already in jail awaiting trial in connection with another murder, had been covering his mouth and nose with a black and white bandanna when he opened fire in the 2000 block of East 71st Street and hit Osho Mobolaji on Aug. 13, 2010, Assistant State’s Attorney Dan Griffin said.

As he fled, Wells’ bandanna fell to the ground and was recovered by police, who sent it to the Illinois State Police forensic lab, Griffin said.

Wells was also identified by a witness in a lineup earlier this week, Griffin said.

Wells, of the 7100 block of Jeffrey Boulevard, was ordered held in lieu of $2 million bail Friday.

Wells is currently in jail for his alleged role in a September 2013 murder that took place in the same area where Mobolaji was gunned down.

In that shooting, Wells and an accomplice are accused of chasing rival gang member Jaleel Pearson into a store in the 2200 block of East 71st, authorities said.

Wells, who was armed, blocked the door while the other person opened fire and shot Pearson, authorities said.

Email: rhussain@suntimes.com

Twitter: @rummanahussain