One man is dead and another was seriously injured after they were hit by a truck along Derby Highway last week.
The two pedestrians were walking along the highway just before 6pm on Thursday, May 16, around 29 kilometres south of Derby, when an Isuzu truck ploughed into them.
A 46-year-old man from Looma died at the scene. A 39-year-old man was seriously injured and was flown to Royal Perth Hospital in a critical condition.
Police said the 65-year-old driver of the truck was assisting them with their inquiries.
Anyone that witnessed the crash, or saw the pedestrians or the truck prior to the crash is asked to call Crime Stoppers on 1800 333 000 or to make a report online at crimestopperswa.com.au.