Deputies say an 11-month-old girl accidentally fell out of a third-floor window in Chula Vista has died.  The incident occurred at about 6:40 p.m. Monday in the 1200 block of Santa Cora Avenue, according to Chula Vista police. Officers found the child unresponsive and initiated CPR.  The child was then transported via medical helicopter to Rady Children's Hospital, where she later died.  Police say detectives from the Family Protection Unit investigated the incident and determine it was an accident.