June 26  -- Michael Jackson's death yesterday may set off a rush for refunds by some of the about 1 million fans who bought tickets to "This Is It," the performer's 50- show, sold-out London run.

Jackson, who was 50, probably suffered cardiac arrest at his Bel-Air mansion, UCLA Medical Center said. His performances at the more-than 20,000-seat O2 arena, set to begin July 13, were expected to generate revenue of as much as $150 million from ticket sales, concessions and merchandise, Billboard magazine and Goldman Sachs Group analyst Mark Wienkes estimated.

Promoter AEG Live will announce refund details in due course, Lucy Ellison, a spokeswoman, wrote in an e-mail to Bloomberg News. At least one insurer at Lloyd's of London and a unit of Allianz SE are among those who issued policies for the promoter and ticket sellers.

"Most pre-existing conditions wouldn't be covered in a standard insurance contract," Duncan Fraser, a London-based partner at insurance broker Jardine Lloyd Thompson Group Plc. "Similarly, if someone dies from anything self-inflicted, like drugs or alcohol, that won't be covered."

The Los Angeles County coroner's office said it will conduct an examination to determine the cause of death. The coroner investigates when there is no death certificate signed by a doctor, said Amanda Betat, a police spokeswoman.

Police today were seeking the physician who tried to resuscitate Jackson yesterday at his Bel-Air home. The singer wasn't breathing when paramedics arrived, began treatment and took him to the UCLA Medical Center.

PayPal Refunds

EBay UK Ltd. has no plans to reimburse customers who bought tickets through its auction site, unless they paid via the online payment system PayPal no longer than 45 days ago, according to Jenny Hill, a company spokeswoman.

"We are working quickly to remove tickets currently listed for sale on the site and would encourage everyone who has bought tickets through EBay to contact the seller in the first instance to discuss a refund," Hill said.

AEG Live, controlled by billionaire Philip Anschutz, said fans bought about 1 million tickets, at a face value of 50 to 75 pounds ($82.44 to $123.66), in the four hours after they went on sale March 13. Jackson, who was to collect a share of ticket sales, would have received about $50 million, according to Billboard.

In May, Jackson postponed the first four shows, saying he needed more time to prepare. AEG Live Chief Executive Officer Randy Phillips told Billboard magazine last month that the event was "well insured" and that Jackson had passed a physical "with flying colors."

Lloyd's of London

Lloyd's of London, the world's largest insurance market, insured a part of the tour, Louise Shield, a Lloyd's spokeswoman, said in a telephone interview. She declined to comment on the policy's details.

Seatwave Ltd., a marketplace for tickets already purchased, expects Allianz, Europe's biggest insurer, to pay out around 2 million pounds through subsidiary Mondial Assistance Group to compensate its customers, CEO Joe Cohen said by telephone.

Margot Tomkinson, a spokeswoman for Mondial Assistance, confirmed in an e-mail that the company is in discussions with Seatwave regarding the tickets. She said she couldn't provide any further comment at this stage.

Validus Holdings Ltd., the Bermuda-based reinsurer, said it has "limited potential exposure" to any contingency loss arising from the death. Its Talbot Holdings Ltd. subsidiary isn't the lead underwriter on the Lloyd's placement and has "a maximum net exposure of less than $3 million, net of reinsurance recoveries and reinstatement costs," the insurer said today in an e-mailed statement.