A convicted killer has been charged with the murder of a fellow inmate at a Mission prison.

James Saar has been charged with the second degree murder of Troy Robert Squires in Dec. 2011, a spokesperson for the Integrated Homicide Investigation Team said Thursday.

“[Squires] suffered injuries consistent with an edged weapon,” said Sgt. Jennifer Pound. No other details about the murder have been released.

There was no known relationship between the two men “other than being inmates,” Pound said. She confirmed the men were not cell mates.

Saar was serving a life sentence for homicide related charges and aggravated assault at the time of the murder, while Squires was being held indefinitely as a dangerous offender.

Prior to the new murder charge, Saar was eligible for parole in 2017.

Correctional officers discovered an unresponsive Squires in his cell, and he was pronounced dead on the scene.

Saar was moved to a maximum security institution outside of B.C. shortly after the murder.

The Mission Institution, a medium-security federal prison just north of Mission, houses 259 inmates and opened in 1977.