(Walla Walla, WA)  --  Officials say Christopher Monfort, who was serving life in prison for killing a Seattle police officer, was found dead in his cell.  The state Department of Corrections says Monfort was found unresponsive yesterday and there were no signs of foul play.  He was pronounced dead by paramedics.  Monfort killed Officer Timothy Brenton and wounded his partner, Britt Kelly, when both were shot while sitting in their patrol car on Halloween night in 2009.