KANSAS CITY, Kan. (AP) — An 18-year-old man has pleaded guilty to charges stemming from a shooting that a Kansas City, Kansas, police captain was investigating when he was killed.

DaQon Sipple pleaded guilty Thursday in Wyandotte County court to charges including aggravated assault and criminal discharge of a firearm. Prosecutors say Sipple fired shots that police were called to investigate on July 19.

After Sipple was arrested that day, Police Capt. Robert David Melton was investigating the shooting when a man fired shots into Melton’s patrol car, killing him.

Jamaal Lewis is charged with capital murder in Melton’s death.

The Kansas City Star reports that as part of the plea agreement, Sipple has agreed to testify if he’s called as a witness in the case against Lewis.

Sipple’s sentencing is Nov. 18.