RAPID CITY, S.D. (AP) — Four Washington state residents charged with assaulting a South Dakota Highway Patrol trooper have pleaded not guilty to charges.

Authorities say 10-year veteran Zachary Bader was assaulted Oct. 24 while making a traffic stop on Interstate 90 east of Rapid City.

KEVN-TV reports that 33-year-old suspect Donald Willingham pleaded not guilty Tuesday to attempted murder, aggravated assault, and drug and weapons charges.

Twenty-two-year-old Jonathan Melendez, 26-year-old Desiree Sukert and 23-year-old Chase Sukert pleaded not guilty to being accessories, along with drug and weapons counts.

Authorities say they recovered more than 50 pounds of marijuana, $33,000 in cash and a handgun after the October incident.

The Rapid City Journal reports that Bader was released from a Rapid City hospital on Nov. 7 and is recovering at home.

Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.