Convicted cop killer Kevin Johnson, 37, was executed by lethal injection in Missouri Thursday evening.

Johnson was sentenced to death on Feb. 1, 2008, for the ambush murder of Kirkwood Police Sergeant William McEntee, Fox 2 reports.

Johnson, then 19, killed McEntee during a fit of rage on July 5, 2005, over his younger brother’s death, which he blamed on police.

According to court documents, McEntee was one of the police officers sent to Johnson’s house to serve a warrant for his arrest. Johnson was on probation for assaulting his girlfriend, and police believed he violated probation. After waking his 12-year-old brother, Joseph “Bam Bam” Long, the boy ran to his grandmother’s house next door, where he began having a seizure and collapsed.

Sgt. McEntee returned to Kirkwood’s Meacham Park neighborhood to check on a report of fireworks later that night. Johnson then ambushed McEntee in his car, shooting him multiple times. He returned a short time later and shot Sgt. McEntee twice more after McEntee had pulled himself from the car and was on his hands and knees.

Missouri Governor Mike Parson issued the following statement after Johnson’s death:

“Today, the State of Missouri carried out Kevin Johnson’s sentence as ordered by the Missouri Supreme Court. Mr. Johnson was convicted and sentenced to death for the 2005 murder of Sgt. Bill McEntee. Mr. Johnson’s claims were reviewed by state and federal courts, and no court reversed his conviction or sentence. We hope that this will bring some closure to Sgt. McEntee’s loved ones who continue to anguish without him.”