Charges were upgraded against a South Side man a few months after the teenage boy he’s accused of shooting in Englewood died.

Corey Strother Jr. was only 15 in December 2015 when Swonn Herron put a bullet in his neck in the 5900 block of South Princeton Avenue, Cook County prosecutors said Tuesday.

Corey, who had since turned 16, died on Aug. 26 from complications related to that injury, Assistant State’s Attorney Holly Grosshans said.

Herron, now 23, was initially charged with attempted murder and aggravated battery with a firearm after two witnesses identified him, Grosshans said.

Judge Donald Panarese Jr. placed him on $750,000 bail in early January.

Now that Corey has died, Herron, a reputed member of the Black P-Stones, is facing first degree murder charges.

On the day of the shooting, as Corey and his family and friends stood outside, Herron came out of a black SUV someone else was driving, pointed a handgun at the teenager and told him not to move, Grosshans said.

Herron shot once and then got back into the SUV, which drove away, Grosshans said.

Those who were with Corey eventually flagged down police but Herron was gone, Grosshans said.

Corey was placed on life support at Stroger Hospital, Grosshans said. He then went to an area rehab center before he was taken to a children’s hospital, Grosshans said.

On Tuesday, Judge Adam Bourgeois Jr. ordered Herron, of the 5000 block of South May, held without bond.