Joanne Mjadzelics was instrumental in exposing the disgraced singer’s crimes

Forty-eight-year-old was serving 29-year prison sentence after admitting multiple child sex offences

Watkins was serving a 29-year sentence imposed in 2013 after admitting 13 child sex offences.

Welsh musician and convicted pedophile Ian Watkins was stabbed to death in a prison attack in Yorkshire, England on Saturday. The Lostprophets singer was 48.

Musician sold millions of albums around the world before he was jailed for 29 years for child sex offences

Lostprophets singer Ian Watkins was reportedly killed in a prison attack, more than a decade after he was convicted for a string of sexual offenses.

Joanne Mjadzelics was instrumental in exposing the disgraced singer’s crimes

Multiple police forces failed to investigate claims about Watkins' depraved behaviour properly

Ian Watkins, 48, died on Saturday after being seriously assaulted at HMP Wakefield

Former Lostprophets singer Ian Watkins was serving a 29-year sentence for child sex offenses.