Three detectives who received complaints about paedophile rocker Ian Watkins four years before his arrest will face disciplinary proceedings, a police watchdog has said.
Former Lostprophets frontman Watkins is serving a a 35-year sentence after admitting a string of sex offences - including the attempted rape of a fan's baby.
The disgraced singer was arrested in 2012 and jailed the following year.
However, the Independent Police Complaints Commission (IPCC) said South Wales Police was given information about Watkins back in 2008.
Following a detailed probe into the Welsh force, the IPCC has said there are cases to answer against the three officers - one detective sergeant and two detective constables.
A spokesman said: "The IPCC investigator recommended that a detective sergeant has a case to answer for gross misconduct ... (after) the officer did not take sufficient action to progress inquiries.
"The IPCC investigator was also of the view that two detective constables have a case to answer for misconduct, as they did not undertake all reasonable and practicable lines of inquiry."