The Supreme Court in Perth has been told a man used a chainsaw to dismember a man after killing him with an axe.
Brett McDonald is on trial accused of the wilful murder of 41 year-old acquaintance Steven Peterson sometime between September and December 2005.
Mr Peterson's bones were found in a quarry in Munster in March last year.
Lawyers for Mr McDonald have told the court he does not deny killing Mr Peterson but that he suffers a significant mental disorder that deprived him of the capacity to know that what he was doing was wrong.
Prosecutors allege the two men were never friendly and that Mr McDonald had made his dislike for Mr Peterson known over a number of months.
ABC
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