According to the New York Daily News, authorities are searching for Stuart Lynn Dunn, who made an "unauthorised departure" from the Olive Vista Behavioural Health Center on Saturday.
Dunn, 30, was accused of breaking into the actress' West Hollywood condo and remaining inside for two weeks. She was not living there at the time. Dunn also showed up at Kunis' gym, forcing her to hide in her vehicle until security and police could arrive.
Fearing for her safety, Kunis took out a restraining order against Dunn, but he violated it.
Kunis, who recently had a baby with actor Ashton Kutcher, has been notified of Dunn's escape, Los Angeles County Sheriff's Department Lt. Martin Rodriguez told the Los Angeles Times.