OKLAHOMA CITY - Police say one of the men killed in a triple shooting in southeast Oklahoma City opened fire on two other men before he was shot.

Police say Marcell Grigsby, 27, shot two people in the 300 block of S.E. 23rd Street on Tuesday. Grigsby killed Lamar Shirley, 31, and injured Cleveland Calderon, 21. Calderon was treated at a nearby hospital and released.

Police say Grigsby was then shot and killed, but they are not revealing who pulled the trigger. Investigators say more people are involved in this case, and they're asking for the public's help. If you have any information about the shootings, call the Homicide Tip Line at (405) 297-1200.