WALLA WALLA COUNTY, Wash. -- A confidential informant was key in leading law enforcement to the prime suspect in a murder. A woman's body was found dumped in Walla Walla County. The probable cause statement explains why Carlos Valdez, 17, is facing first degree murder charges. Two other people face charges for helping Valdez flee after Yesica Olivos, 20, was found dead. Valdez and his friends were arrested in Spokane days after the crime.