ELOY, Arizona — An inmate accused of killing an Idaho prisoner in Arizona last month was incarcerated for murdering a Rexburg man and attempting to kill the man’s wife.

Multiple sources tell EastIdahoNews.com that the suspect in the Arizona prison murder is Pierre Lake, a 22-year-old from Rigby who is serving a sentence of 30 years to life after pleading guilty to the first-degree murder of Ralph Brian. He also pleaded guilty to the attempted murder of Karen Brian, Ralph Brian’s wife.

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Lake was sentenced in Madison County in January 2024 before being moved to the Saguaro Correctional Center, a private prison in Eloy, Arizona.

On Aug. 20, correctional staff responded to a report of an inmate assault around

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