Michael Lohan has launched a manhunt to find the doctor who treated his out-of-control daughter Lindsay for an overdose of cocaine and painkillers four years ago, RadarOnline.com has exclusively learned.

The Lohan patriarch recently visited the popular celeb hangout Chateau Marmont in Hollywood seeking information about what happened on the night of November 12, 2006, when a doctor was forced to revive the hard-partying star at the hotel.

The doc discovered a "stash of cocaine and a pile of prescription drugs" in the room, it was reported at the time.

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