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From the moment he stepped into his cell at HMP Wakefield, notorious sex offender Ian Watkins was marked.

In the UK's largest maximum-security prison, chillingly dubbed Monster Mansion, there's an unspoken rule that inmates don't ask about each other's crimes. However, the infamous Lostprophets frontman couldn't escape his notoriety - everyone was aware of his appalling depravity .

In 2013, the Welsh vocalist was sentenced to 29 years behind bars for 13 horrific sexual offences, including attempted rape and sexual assault of children under 13 years old. One of his victims was a mere 10 months old.

The "determined" sex offender had amassed a collection of child abuse images and videos. A staggering 27 terabytes of data storage from computers and devices were found in W

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