Kurt Cobain's widow, Courtney Love, has been challenged to take a filmed polygraph test in exchange for $50,000 by an author who believes the late Nirvana frontman was murdered.

The offer comes on the heels of the purported leak of Cobain's autopsy report, which claims to confirm that the rock star took his own life with a shotgun at his Seattle home in April 1994 at age 27.

But Ian Halperin, a Canadian documentary maker and bestselling author, claimed in a book last year that Cobain could not have killed himself because he had 70 times the lethal dose of heroin in his system at the time of his death.

In a 2023 interview with The U.S. Sun, Halperin urged Love to take a polygraph test to dispel any doubts that she was involved in Cobain's death, vowing to publicly declare her innocence through a Times Square billboard if she passes the test.

Now, the author added an offer of $50,000, claiming he was backed by a "well-known executive" who believes in the conspiracy theory that Cobain was murdered.

"I want to update my offer. If Courtney agrees to take the test and she passes, she gets her choice. I'll either take out that billboard in Times Square, or a person, who is [a] longtime music industry executive, has offered to give her $50,000 cash if she passes," Halperin told the outlet.

"I am keen to find the truth. I just want her to finally clear this and get to the truth in our lifetime. A polygraph would be a step to erase the doubt forever," added Halperin.

Love And Death: The Murder Of Kurt Cobain Author Ian Halperin
(Photo : Getty Images/Scott Gries)
Author Ian Halperin during a press conference to announce the release of the new book "Love And Death: The Murder Of Kurt Cobain" at the Hilton Times Square April 5, 2004 in New York City.

Love has consistently denied any involvement in Cobain's death. She has not publicly addressed Halperin's comments.

Halperin previously raised concerns about Cobain's suicide note, claiming to The U.S. Sun, "The five final lines of the suicide note were not in Kurt Cobain's handwriting."

The author also claimed that the medical examiner who carried out Cobain's autopsy allegedly admitted to having been intimate with Love and having a "conflict of interest" when ruling that the Nirvana singer killed himself.

Meanwhile, Tom Grant, the private investigator hired by the Hole musician to find her husband after he left a drug rehab center days before his death, also questioned the authenticity of the suicide note.

Grant suggested that the note was originally written by Cobain to tell fans he was stepping away from the music industry but had "strange" lines added to the bottom by an unknown individual, according to the outlet.

The private investigator also alleged to the New York Daily News that he believes "Love was involved in a conspiracy in the death of Kurt Cobain."

The former Los Angeles County Sheriff's Department detective claimed the potential motive could be money or Cobain's rumored plans to leave Love.

 Kurt Cobain
(Photo : Getty Images/Chris Furlong)
A selection of prints by Michel Linssen from the Redferns collection, depicting Kurt Cobain playing the guitar in a recording studio, pictured at the Getty Images Hulton Archive, London E16, September, 12 2023.

Last month, Grant shared a link on X, formerly Twitter, of what he claims to be Cobain's official autopsy report.

The report has never been made public due to Washington state privacy laws.

The purported autopsy report claimed Cobain had morphine, codeine and diazepam in his blood, as well as opiates and benzodiazepines in his urine at the time of his death.