Quiana M. Williams will plead guilty to five counts of first-degree rendering criminal assistance, Pierce County deputy prosecutor Stephen Penner said Friday.
Williams would face up to five years in prison when sentenced if the plea deal goes through Thursday as scheduled, Penner said.
Authorities suspect Williams picked up Clemmons in Seattle on Nov. 29 after he gunned down Lakewood police Sgt. Mark Renninger and officers Tina Griswold, Ronald Owens and Greg Richards.
Williams took Clemmons to her home, where she helped him bandage wounds he suffered in the shootings, allowed him to do laundry and lent him her phone before driving him to another part of Seattle and dropping him off, court records show.
A Seattle police officer shot and killed Clemmons on Dec. 1.
Williams pleaded not guilty after her arrest in early December and has been held in the Pierce County Jail since. Efforts to reach her attorney, Kirk Chip Mosley of Tukwila, were unsuccessful Friday.
Williams is one of six people charged with helping Clemmons or his alleged getaway driver in the aftermath of the shootings.
A Pierce County jury convicted Clemmons sister LaTanya Clem-mons in June of providing aid to suspected getaway driver Dorcus Allen. She was sentenced to five years in prison.
The four others charged with rendering criminal assistance go to trial in October.
Allen is charged as an accomplice with four counts of aggravated first-degree murder. His trial is set for next year.
Prosecutor Mark Lindquist is deliberating whether to seek the death penalty for Allen, who pleaded not guilty.