Guess where nutty Evi Quaid was scoring her drugs, according to a private investigator? If you said Jacko Death Doc, Conrad Murray go to the head of the police line-up!

Private eye Becky Altringer said Evi Quaid went to Dr. Conrad Murray to fill her many drug prescriptions, including one for Demerol, which she allegedly liked to snort on a regular basis, RadarOnline.com reports.

Evi and National Lampoon hubby Randy who were on the lam for a variety of  hotel "stiff-jobs" were finally arrested and then released on bail in Texas after Evi went "psychotronic' on the cops.

"Evi told me she got her Demerol from Dr. Murray and plus another doctor," Altringer said. "She told me that she and Michael Jackson had the same doctors."

CLICK HERE for the full pharmacological shopping list and what the drug-addled Quaid thinks about the hush-hush mystery deaths of Heath Ledger, David Carradine, Michael Jackson and Natsaha Richardson.