Kurt Cobain was murdered, according to an award-winning documentary producer who even challenges the rock star’s widow, Courtney Love, to answer questions about her husband’s death while being examined by a lie detector.

The above public statement comes after years of speculation about the Nirvana singer’s death.

Ian Halperin believes his new book Case Closed: The Cobain Murder: The Killing And Cover Up of Kurt Cobain presents “convincing arguments” that Cobain did not, contrary to popular belief, commit suicide.

The investigative journalist, who has been investigating Cobain’s suicide since the mid-1990s, says he has uncovered new evidence that the Nirvana frontman was murdered instead – though he is not accusing Love or anyone else of the murder.

Halperin, however, believes a lie detector test will help clear her name after nearly three decades of suspicion, speculation and comments from some Nirvana die-hards that she knows full well under what circumstances Cobain died or even worse that she is involved in his death.

Cobain, who was a heroin user, was found dead in a greenhouse room above the detached garage at his home in Seattle’s Lake Washington neighborhood on April 8, 1994.

He was holding the shotgun that had killed him, having blown his brains out.

Although the coroner and the Seattle Police Department ruled the death a suicide, theories that Love may have played a role in Cobain’s death persist in light of the apparent discrepancies in the evidence.

In an exclusive interview with US Sun, Halperin said: “In this book, I firmly conclude, the police were wrong a thousand percent and Cobain’s death was not murder but murder.”

“The verdict must be changed from suicide to murder,” he emphasizes.