THE circumstances of Michael Jackson's death remain unclear. Law enforcement sources said Los Angeles police detectives have opened an investigation into the death, although they stressed there was no evidence of criminal wrongdoing, the Los Angeles.

The detectives plan to interview family members, friends and Jackson's doctors to figure out what happened. The Los Angeles County coroner's office will determine a cause of death.

LAT said paramedics were called to a Bel-Air home - described as a French chateau built in 2002 with seven bedrooms, 13 bathrooms, 12 fireplaces and a theater - that Jackson rented for US$100,000 (S$145,000) a month. The home is about a six-minute drive from UCLA Medical Centre.

Jackson has three children - sons Prince Michael, 7, and Michael Joseph Jackson Jr, 12, and daughter Paris Michael Katherine, 11.

The news comes as Jackson, 50, was attempting a comeback after years of tabloid headlines, most notably his trial and acquittal on child molestation charges.

In May, the Times reported that Jackson was living in a Bel-Air mansion and rehearsing for a series of 50 sold-out shows in London's O2 Arena. Jackson had won the backing of two billionaires to get the so-called King of Pop back on stage.

The concerts had been scheduled to begin July 13.

Johnny Caswell, a principal at Centerstaging, the Burbank soundstage where Jackson rehearsed for his London concerts, watched many of the run-throughs and said he was 'absolutely shocked' by the performer's death.

Jackson, he said, was 'very frail' but approached the rehearsals with boundless energy, according to the LAT report.

'He was working hard. Putting four days a week in here. Six hour a day. Working hard. Dancing,' Caswell said. 'We're in shock over here.'

The performer moved from the Burbank facility to the Forum arena in Inglewood at the beginning of June, Mr Caswell said.

His backers envisioned the London shows as an audition for a career rebirth that ultimately could encompass a three-year world tour, a new album, movies, a Graceland-like museum, musical revues in Las Vegas and Macau, and even a 'Thriller' casino.

Such a rebound could wipe out Jackson's massive debt, estimated at US$400 million.

LAT said Jackson needed a comeback to reverse the damage done by years of excessive spending and little work. He had not toured since 1997 or released a new album since 2001 but continued to live like a megastar.

To finance his opulent lifestyle, he borrowed heavily against his three main assets: his Neverland Ranch, his music catalog and a second catalog that includes the music of the Beatles that he co-owns with Sony Corp. By the time of his 2005 criminal trial, he was nearly $300 million in debt and, according to testimony, spending $30 million more annually than he was taking in.

Compounding his money difficulties were a revolving door of litigious advisers and hangers-on. Jackson had run through 11 managers since 1990, according to Frank DiLeo, his manager and friend of three decades.

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