The FBI is offering $20,000 for information leading to the recovery of the handgun used to kill two police officers and a third victim.

FBI agents in Tampa said Thursday that the same gun, using .38-caliber bullets, was used in the June 29 fatal shootings of police Officers David Curtis and Jeffrey Kocab and the May 18 killing of 21-year-old Derek Anderson.

Kocab's wife, who was pregnant when her husband was killed during a traffic stop, delivered a stillborn baby Wednesday.

Dontae Morris has been arrested in connection with the three homicides. He pleaded not guilty Thursday to first-degree murder. Hillsborough County prosecutors said they will seek the death penalty for Morris.

The FBI asks anyone with information about the weapon to contact the Tampa FBI office at 813-253-1000. Tips can be anonymous.