Joe Jackson, in Madrid to promote a worldwide tour of the hit Spanish musical "Forever King of Pop," said on Friday he believes Dr. Conrad Murray was acting on behalf of other people involved in Michael's career and said Michael had warned his family he would be killed over the publishing rights to hit songs such as "Thriller" and "Billie Jean."

"I want to get the other people that's involved, not just Dr. Murray. That's why I'm trying to get a federal investigation, so they can grab them all," Jackson said. He characterized Murray as "just the fall guy," in an interview with Reuters, but declined to say who else he thought might be to blame in the death of his superstar son.

"I'm not calling names, but they know who they are," said the patriarch of the family of Jackson singers who helped define the Motown sound of the late 1960s and '70s. "Michael knew that something was going to happen to him before it happened," said Joe Jackson, who wore his customary black fedora and gold chains.