Police have identified a police officer and three others killed in a morning shooting at a Springfield convenience store late Sunday night.

The shooter, Joaquin S. Roman, 31, killed himself after firing shots at several people and police inside a Kum and Go on East Chesnut near U.S. 65 around 11:45 p.m. Witnesses told police the gunman crashed his car into the convenience store, then entered the store shooting customers and an employee.

Police say Officer Christopher Walsh, 32, Troy D. Rapp, 57, of Springfield, Shannon R. Perkins, 46, of Springfield and Matthew Hicks, 22, of Springfield died in the shooting. Rapp worked at the Kum and Go store. Perkins worked for WCA Waste Corporation.

Springfield Police Officer Josiah Overton, 25 and a fourth victim inside the store were also injured. The victim inside the store has not been identified. Both remain hospitalized.

Investigators say when officers arrived at the store, the shooter began firing at them from inside. Other responding officers arrived and made entry into the store where they found the shooter deceased from an apparent self-inflicted gunshot wound. Police say there were several other calls of shots fired linked to Roman.

Detectives continue to investigate and are asking anyone who has information about this incident to contact the Springfield Police Department at 417-864-1810 or make an anonymous call to Crime Stoppers at 417-869-TIPS (8477).