Dave Mustaine of Megadeth is distraught over a missing relative, and he is asking for the public’s help in finding her.

Sally Estabrook, the mother of Mustaine’s wife Pamela, has been missing since October 4. She has Alzheimer’s.

Sally Estabrook was last seen at the Pinezanita RV Park and Campground in Julian, California on October 4. Her husband returned from showering at the campground bathroom and could not find her. Police have been looking ever since.

Dave Mustaine, lead singer and guitarist of Megadeth, and former member of Metallica, held a news conference to ask for the public’s help finding his mother-in-law.

“We’re just asking everybody that may have been up there to take a look in your sheds, in your garages, in the thick brush around your house,” Mustaine said at the press conference.

“A lot of times people that wander who have Alzheimer’s are found very close to their homes. They just take shelter underneath bushes,” he said.

He asked hospitals and shelters to look for Estabrook among unidentified patients and drop-ins.

There was a promising lead in the case just yesterday, when someone said they may have seen Estabrook walking along a road in the area. Police later determined that the woman seen was not Estabrook.

Estabrook is white, five feet four inches tall and about 145 pounds, with shoulder-length blond hair. She may be wearing a teal top and white Capri pants. Sally Estabrook is said to be uncommunicative, but may respond to her name.

Hot shot crews combing field for 75 yr old Sally Estabrook. Still no sign of her. @CBS8 pic.twitter.com/y1aDFRrkIh

— Dominic Garcia (@DomCBS8) October 8, 2014