Major Crash officers are investigating a fatal traffic crash in Hacketts Gully, east of Kalamunda on Monday afternoon.
Around 12:30pm, a purple 2014 model Harley Davidson motorcycle was travelling in a north-easterly direction along Mundaring Weir Road and near Ashendon Road, the motorcycle left the road and struck a tree.
The 52-year-old male driver from Pinjarra, received life threatening injuries and was conveyed by ambulance to St John of God Midland Hospital where he died.
Major Crash officers would like to speak to anyone or saw the crash or the Harley Davidson motorcycle prior to the crash.
Anyone with any information is urged to call Crime Stoppers on 1800 333 000 or report online at www.crimestopperswa.com.au