Bizarre -- a pharmacist who testified he shipped MASSIVE amounts of Propofol to Dr. Conrad Murray in the weeks leading to Michael Jackson's death has disappeared without a trace, prosecutors claim.

According to prosecutors, Tim Lopez -- a former pharmacist at Applied Pharmacy Services in Las Vegas -- has mysteriously moved to Thailand and cannot be found.

Prosecutors now want a judge to let them use Lopez' previous testimony from the preliminary hearing in January -- when he claimed Dr. Murray ordered several large quantities of Propofol, beginning on April 6, 2009.

Two hearings have been set for next week to decide if the testimony will be permitted.