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Admitted killer Calvin Nimoh was raging with anger after his girlfriend revealed she wanted to have an open relationship with him — and a lesbian tryst with a teen, just minutes before Nimoh fatally stabbed cancer researcher Dr. Mark Ernsting.

Nimoh testified Friday at his first-degree murder trial that he forgot everything that happened immediately after Ernsting, a total stranger, strolling in his downtown Toronto neighbourhood, propositioned him for sex by saying, “Do you want have some fun?”

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When Nimoh regained consciousness, he was standing over Ernsting’s dying body as a McGill St. resident screamed at him.

“Something was wrong and I ran away,” Nimoh told his lawyer Charn Gill.

Nimoh’s knife’s blade snapped when it was plunged into Ernsting’s head, remaining lodged in his brain. But the witness had no memory of the horrific violence.

He explained the “having fun” line is meant as a casual sexual proposition among gays. A condom was found in Ernsting’s pocket.