SEATTLE — The man convicted of killing a Seattle police officer from Marysville in 2009 has been sentenced to life in prison without parole.

Christopher Monfort was convicted last month of killing officer Timothy Brenton of Marysville.

The jury rejected his insanity defense.King County Superior Court Judge Ronald Kessler said July 30 that “this court sentences Mr. Monfort to die in prison.”

Monfort’s defense didn’t dispute that he killed Brenton. Instead, they argued he was mentally ill. His attorneys said Monfort believed if enough officers were killed, the deaths would end police brutality.