Gregory Jonas was a 59-year-old Centreville, Illinois police officer who was shot and killed while on duty on June 2, 2009. He was patrolling an apartment complex in the 4700 block of Tudor Avenue around 2:00 am and was questioning an individual when he was shot in the head and died at the scene. Reports state he was shot in the back of the head while in uniform.

Jonas had 15 years with the Centreville Police Department and previously worked eight years with the Alorton Police Department. He was described as active in efforts to reduce neighborhood violence and is survived by his wife, two sons, four daughters, his mother, and ten grandchildren. The Major Case Squad of Greater St. Louis led the investigation after the Centreville department requested assistance.

The suspect, 22-year-old Lemuel A. Houston, was apprehended and charged with first-degree murder; bond was set at $10,000,000. On June 13, 2012, Houston pleaded guilty but mentally ill and was sentenced to 53 years in prison without parole. Is there anyone who knew Officer Jonas or who has information about the night he was killed?