Stars line up for Jackson tribute concert

VIENNA, Sept. 8 (UPI) -- Akon, Chris Brown, Mary J. Blige, Sister Sledge and Natalie Cole are to perform at the upcoming Michael Jackson tribute concert in Vienna, organizers said.

Jackson died June 25 at the age of 50. His death has been declared a homicide after lethal levels of the anesthesia propofol were found in his system. Conrad Murray, the doctor who administered the drug to Jackson is under investigation, but no charges have been brought against him.

The BBC said Jackson's brother Jermaine told reporters at a press conference Tuesday that up to 25 performers had agreed to sing some of the late recording artist's greatest hits at the Sept. 26 concert at Vienna's former imperial Schoenbrunn Palace.

Additional performers are to be announced later this week, said Jermaine Jackson, who added he plans to sing a virtual duet with his dead brother at the event, which is expected to draw about 65,000 fans.