Ian Watkins, the former frontman of the British rock band Lostprophets, was killed on Saturday in a prison attack in England , where he was serving a 29-year sentence for multiple sex crimes against children.

Watkins, 48, pleaded guilty in November 2013 to 13 child sex offenses — including making or possessing child pornographic images, sexually assaulting at least one child under 13 and attempting to rape a baby.

He was sentenced the following month for what the judge called “new depths of depravity.” He was serving his lengthy term at a prison in Wakefield, England, nicknamed the “Monster Mansion” due to the high-profile criminals held there.

On Saturday, West Yorkshire Police said in a statement that officers were sent to the prison at around 9:40 a.m. following the report of

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