Michael Jackson's ex-wife Debbie Rowe broke down in tears on Wednesday (14Aug13) as she testified about the pop superstar's longrunning substance abuse issues, revealing doctors would compete to prescribe the King of Pop with the "better" drugs. The former nurse opened up about the singer's personal problems during her testimony as a defence witness for AEG Live bosses in the ongoing wrongful death lawsuit filed against them by Michael's mother, Katherine Jackson, and his three children. Rowe, the mother of the star's eldest two kids, tearfully told jurors at Los Angeles County Superior Court that the Thriller hitmaker, who had suffered serious burns to his scalp while filming a Pepsi Cola commercial in 1984, struggled with an "incredible" fear of pain and had such a low tolerance for drugs, it didn't take long for him to become hooked on painkillers like Demerol and Diprivan. She singled out medics like dermatologist Dr. Arnold Klein and plastic surgeon Dr. Steven Hoefflin for enabling the singer, alleging that they would do anything to keep Michael as their patient and would try to outdo one another by issuing stronger doses. Rowe, who was present during a number of the star's treatments with both Klein and Hoefflin, said, "These idiots were going back and forth the whole time, not caring about him." She then described Dr. Conrad Murray, the physician convicted of inadvertently killing the superstar in 2009 by giving him an overdose of surgical anaesthetic Propofol, as the one who "got in there and killed him". Lawyers representing AEG Live executives called Rowe, who was married to Jackson for three years from 1996, to testify in a bid to prove that Michael had been struggling with substance abuse issues for years before they signed a deal for his doomed This Is It London residency. They are also fighting accusations that they were responsible for hiring Murray, insisting he served as the singer's personal doctor and was not directly employed by the concert promoters. The case continues.