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Dustin Paul, seen here in a photo taken before the shootings, is charged with three counts of second-degree murder and two counts of attempted murder. (CP)

Two final witnesses testified at a triple-murder trial that it's possible the accused heard voices in his head before going on a shooting spree on the Penticton Indian Reserve two years ago.

Dustin Paul, 26, has already admitted he shot five of his friends, killing three of them and wounding the other two during a bush party.

Testifying in his own defence Thursday, Paul told the jury he'd been consuming alcohol, cocaine and marijuana for hours.

Paul said he heard a voice in his head telling him to wake up to a better life. He then shot hisfive childhood friends, believing they would also wake up to a better life, and tried to kill himself with a knife.

Two forensic psychiatrists— one testifying for the Crown and the other for the defence— told the jury it's likely that Paul had a drug-induced hallucination.

Paul's defence team argues that because of his state of mind,he was incapable of forming intent to kill the three men andcould notbe found guilty of second-degree murder.

Without proving intent, they saytheir client is, at most, guilty of manslaughter.

The jury will hear closing arguments on Monday.