Police were called to a disturbance at a home in Whitley St, Withers about 10.45pm last night.
When police arrived they found a 23-year-old man with serious injuries as a result of an altercation ata nearby address.
He was taken to Bunbury Hospital where he died a short time later.
A 31-year-old man is assisting police with their inquires.
Anyone with any information regarding this incident are asked to contact Crime Stoppers on 1800 333'The West Australian' is a trademark of West Australian Newspapers Limited 2013.
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