ENGLAND, UK — Lostprophets singer Ian Watkins died in a United Kingdom prison Saturday, according to West Yorkshire Police . He was 48.

Police arrested two men, one 25 and the other 43, on suspicion of murder. They responded to the HMP Wakefield prison about a "serious assault on a prisoner" around 9:39 a.m. Authorities pronounced Watkins dead at the scene.

An investigation is ongoing and no motive is known at this time. No other details are available.

Watkins was serving a 29-year prison sentence at HMP Wakefield in England. His sentence began in 2013 when he pleaded guilty to 13 child sex offences, according to Reuters .

The high-security prison, which houses some of the UK’s most dangerous offenders, is nicknamed the "Monster Mansion," according to the Wakefield Express . It

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