Major Crash officers are investigating a fatal crash that occurred in Balingup on Monday November 6 2017 around 1.10pm.
At the merge point of the overtaking lane on South Western Highway near Russells Road, a blue Honda Civic travelling south, impacted with the front of a blue and black Volvo truck travelling in the same direction.
The Honda then veered into the northbound lanes and into the path of a blue Kenworth truck travelling north.
The 75 year old driver of the Honda was taken to Royal Perth Hospital, but passed away on Thursday 9 November as a result of his injuries.
The drivers of the trucks were not injured.
Major Crash investigators would like to speak to anyone who may have seen the Honda Civic, Volvo or Kenworth trucks travelling along South Western Highway before the crash.
If you have any information, please call Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au