London, August 27 : Michael Jackson's former wife reportedly tipped cops about how doctor Arnold Klein helped supply the star with powerful drugs.

Debbie Rowe, who used to work as an assistant at Klein''s Beverly Hills clinic, was said to have secretly informed authorities how the singer used aliases to get the drugs from the plastic surgeon, who treated Jackson for 20 years.

Court papers apparently state that detectives got a tip-off from "an unknown female caller", who revealed Jackson used names such as Omar Arnold, Fernand Diaz and Peter Madonie when he saw the medic.

Klein was purportedly accused of helping Jackson stock sedatives including powerful anaesthetic propofol that is believed to have caused his death.

"Rowe holds Klein totally responsible for Jackson''s drug addiction," the Sun quoted sources as saying.

"She believes there is no way he could have got hooked without the help of Klein - and she is potentially the only one who can prove it.

"She must have suspected what was going on for years.

"She could really put the boot into Klein and she has good reason to. It makes her skin crawl to think Klein is the biological father of her kids, like reports suggest," the sources added. (ANI)