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Megadeth Singer's Mother-in-Law Missing

Dave Mustaine of Megadeth
Marc Broussely/Redferns via Getty Images

Dave Mustaine of Megadeth performs on stage at Electric Ballroom on June 12, 2012 in London, United Kingdom.  

Authorities in San Diego County are searching for a missing woman with Alzheimer's disease who is the mother-in-law of Megadeth frontman Dave Mustaine.

U-T San Diego reports 75-year-old Sally Estabrook was last seen Saturday at an RV park and campground in Julian.

Search-and-rescue teams from four counties and the U.S. Border Patrol fanned out Tuesday (Oct. 7) in an area near state Route 79 to look for her.

Sheriff's officials are asking nearby business owners to look through surveillance footage.

Estabrook is the mother of Mustaine's wife, Pam.

The metal singer and guitarist posted this to Twitter on Monday:

Megadeth's latest album, Super Collider, came out last year.


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