Muir was injured during a shooting attempt on the life of mobster Mickey Cohen at Sherry's restaurant on the Sunset Strip at 3:55 a.m. on July 20, 1949. Cohen was struck in the shoulder. Three others were also wounded, including Cohen henchman "Neddie" Herbert, who later died from his wounds. Muir was struck in the backside when a slug ricocheted and left a large bruise. Her first instinct was to call the "Mirror" and get a photographer to the scene while her husband screamed for her to get down.