Michael Jackson’s death may set off a rush for refunds by some of the hundreds of thousands of fans who bought tickets to “This Is It,” the performer’s run of 50 sold-out shows in London.

Jackson, 50, probably suffered cardiac arrest at his Bel- Air mansion on June 25, 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.