Investigators said Tuesday that the decomposed body found on a remote embankment in the Cleveland National Forest near San Juan Capistrano is believed to be that of a 28-year-old Laguna Hills woman who has been missing since February. Erica Alonso, who was 27 years old at the time of her disappearance, was last seen Feb. 15 after leaving her boyfriend's home in Irvine, according to the Orange County Sheriff's Department.