La Toya Jackson speaks, as her mother Katherine listens, at a news conference to announce a tribute concert for the 40th anniversary of the late pop star Michael Jackson's career in Beverly Hills, California July 25, 2011.[Photo/Agencies]

Several members of Michael Jackson's family unveiled plans on Monday for a tribute concert to the late King of Pop, but performers were unnamed leading to a less-than-thrilling announcement for the "Thriller" singer.

The tribute show, supported by Jackson family matriarch Katherine Jackson, will be held on October 8 in Cardiff, Wales at the Millennium Stadium, which holds about 75,000 people. It will be broadcast live via satellite on pay-per-view television and into movie theaters around the world, some of which will screen it in 3D, said promoter Global Live Events.

Katherine Jackson told reporters at the unveiling in Los Angeles that she is proud of the event and the caliber of singers performing. No names were announced on Monday.

"If my son was here today, he would feel the same way, and so I'd like to say thank you very much for helping to keep my son's legacy alive," she said.

Katherine Jackson (L) with her children La Toya, Tito, Jackie and Marlon attend a news conference to announce a tribute concert for the 40th anniversary of the late pop star Michael Jackson's career in Beverly Hills, California July 25, 2011.?[Agencies]

Michael Jackson, who rose to fame in his family of singers then embarked on a solo career that included smash hits such as "Thriller" and "Billie Jean," died in June 2009, of an overdose of the surgical anesthetic propofol he used as a sleep aid.

His physician at the time, Dr. Conrad Murray, has been charged with involuntary manslaughter in Jackson's death. He has pleaded not guilty and a trial will start in September.

Jackson's brother, Jermaine Jackson, tried in vain to mount a tribute concert in Vienna in 2009, but plans were scrapped after he struggled to get big-name acts and the event's organizer went out of business.

Jermaine, and Michael Jackson's father Joe, were not on hand at Monday's announcement. Instead, Katherine was joined by family members, Tito, Jackie, Marlon and La Toya.

"I know that this tribute will be something spectacular," LaToya told reporters.

But Randy and Jermaine Jackson blasted the timing of the new show, which will coincide with the September manslaughter trial of Jackson's doctor.

"While we wholeheartedly support the spirit of a tribute that honors our brother, we find it impossible to support an event that is due to take place during the criminal trial surrounding Michael's death," they said.

Doctor Conrad Murray, charged with manslaughter for giving the singer an overdose of powerful sedative propofol, is due to go on trial with opening statements on September 20, less than three weeks before the Cardiff concert.

"In light of this, we feel it is inappropriate to be involved with such an ill-timed event and its promoter, Global Live," said Jermaine and Randy Jackson in a statement.

"Furthermore, the decision to proceed with this concert disrespects opinions and wishes expressed in the strongest terms to Global Live during conversations in April when this event was presented to the majority of the family."