In 1993, Roch Thériault was sent to prison and began serving his time at Dorchester, a medium-security facility (via CBC News). What happened during his first 18 years there is uncertain, but by 2011, he'd somehow run afoul of other inmates, including a man named Matthew Gerrard MacDonald, who was himself doing life in the facility.

On the morning of February 26, 2011, guards found Thériault dead in his cell, having been stabbed in the neck by a "shiv," which is to say, a homemade weapon made in the prison (per the Roodepoort Record). There was no ambiguity about who had killed him: other prisoners later said that they had heard MacDonald make threatening statements against the former cult leader, and the two had an altercation of some kind (although the exact catalyst for their fight remains unknown). Nevertheless, MacDonald himself admitted what he'd done to the guards almost immediately after killing Thériault, who was 63 at the time: "That piece of s*** is down on the range. Here's the knife, I've sliced him up," he said.

MacDonald, who was already doing life, was given an additional 25 years on his sentence (via CTV News).

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