An ex-girlfriend who helped expose Lostprophets rocker Ian Watkins as being a dangerous pedophile says she’s glad he was murdered in prison — and just surprised it didn’t happen sooner. “I was always waiting for this phone call,” Joanne Mjadzelics told the Daily Mail of her rocker ex having his throat slashed in the UK prison where he was serving 29 years for sex crimes, even against babies. “He was walking around with a target on his back from the first day he entered the prison,” she said. “I