KENNEWICK, Wash. (AP) - Benton County prosecutors plan to dismiss charges against a retired Kennewick teacher after he pleaded guilty in Seattle to sexually assaulting male students during out-of-town trips.

Seventy-two-year-old William B. Pickerel faces at least five years in prison for having sex with or inappropriately touching four boys he took to professional sports games on his own time.

He was a longtime teacher and coach at Kennewick High School who would chaperone groups of teenage students to Seattle.

He also is charged in Benton County Superior Court with one count each of first- and second-degree sexual misconduct with a minor.

Court documents say in that case, he allegedly had sex with a teenage boy in Kennewick after returning from Seattle and, in a later overnight trip to the west side, inappropriately touched another teen as the boy slept.

Sentencing is scheduled for Pickerel is scheduled for June 20. He is being held in a King County Jail.

Pickerel will have to register as a sex offender and will be ordered to have no contact with the victims or any minors under age 18 and not to possess or view child pornography.