The family of Rolling Stones legend Mick Jagger is reportedly in a state of mounting anxiety after the longtime partner of his granddaughter disappeared in England — and authorities say their concern is intensifying by the day.

Alexander Key, 37, the partner of Assisi Jackson, has been missing for three days after last being seen in the village of Boscastle, located along the rugged coast of Cornwall. His sudden disappearance has sparked an urgent search, with police now appealing directly to the public for help.

According to a statement released by Devon and Cornwall Police, Key was last spotted leaving The Cobweb Inn, a local pub in Boscastle, at around 2:30 p.m. on January 23. He has not been seen or heard from since.

“Police are growing increasingly concerned for the welfare of a 37-year-old male who has been reported missing from the Boscastle area,” authorities said, adding that active searches and enquiries are continuing.

Key is described as having a medium build, bright peroxide-blonde hair, and a distinctive sense of style, often wearing brightly colored clothing. In one image released by police, he is seen wearing a vivid orange patterned coat with his hair styled high — an appearance officials say should make him easier to recognize.

Anyone who may have seen Key or has information about his whereabouts is being urged to come forward.

Key shares two children with Assisi Jackson, Ezra, 11, and Romy, 6. The couple has largely stayed out of the public eye, living a quiet life in rural Cornwall while raising their family.

Jackson is the daughter of Jade Jagger, one of Mick Jagger’s eight children. Over the years, Jade has spoken publicly about the closeness of the famously large Jagger family, describing it as a tight-knit, globe-trotting clan bound together by chaos, laughter, and constant movement.

Key, a chef and restaurateur, is well known in the local community as a co-owner of The Rocket Store, a seafood restaurant in Boscastle — making his sudden disappearance all the more alarming to those who know him.

As the search continues, concern is growing not just within the Jagger family, but throughout the tight-knit coastal town, where residents are hoping for answers — and for Key’s safe return.

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