The body of a California hiker who vanished this weekend was recovered Sunday at the base of a cliff on El Cajon Mountain, San Diego sheriff officials said.

The search for Thomas Mark Castiglia went through the night. The 50-year-old told fellow hikers that he was going to walk at a slower pace. The group reported him missing at 2:45 p.m., Fox 5 San Diego reported.

The medical examiner is working to determine exactly how Castiglia died.

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“Castiglia is an experienced hiker and has no known medical conditions,” the sheriff’s department told The San Diego Union-Tribune.