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Megadeth's Dave Mustaine is asking for "good thoughts" and prayers for his mother-in-law as police continue to search for the missing woman. 

Sally Estabrook was last seen Saturday evening at an RV park in Julian, California.  The San Diego County Sheriff's Department says the 75-year-old, who suffers from Alzheimer's, walked away while her husband was in the shower.

Search and rescue volunteers spent the weekend searching the area, but police say they found no trace of her. 

Mustaine sent out a tweet on Monday asking for support, while his daughter Electra has also been busy on social media asking for help from anyone who might be able to provide it. 

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