Norm Stamper, who was in charge of the local police force when Cobain died in 1994, admits he has always has his doubts about the rocker's cause of death and now thinks it's time to take another look at the case and the people involved in the tragic Nirvana star's life.

Appearing in new documentary Soaked in Bleach, which takes a detailed look at Cobain's passing, Stamper says, "I would tell you right now if I were the Chief of Police, I would reopen this investigation."

The former chief of police agrees with many Cobain fans and believes the rocker may have been murdered.

He adds, "We should in fact have taken steps to study patterns involved in the behaviour of key individuals who had a motive to see Kurt Cobain dead.

"If in fact Kurt Cobain was murdered, as opposed to having committed suicide, and it was possible to learn that, shame on us for not doing that. That was in fact our responsibility."