Rahsign Richards, 27, is wanted in connection with the death of Malik Green on Saturday, April 18.
Richards is 6'1" tall and weighs about 160 pounds. His last known address was located on the 300 block of South Broad Street.
Police were initially called to the 400 block of Tasker Street around 2:30 p.m. Saturday. Officers found Green nearby - in the 1600 block of South Lawrence Street - suffering from multiple stab wounds to the chest.
Police rushed him to the hospital, but he was pronounced dead a short time later.
Anyone with information can call or text Philadelphia police at 215-686-TIPS (8477) or submit an anonymous tip online.