Surveillance video shows actress Naya Rivera and son at Lake Piru before her disappearance

A search-and-rescue effort has transitioned to a search-and-recovery operation after actress Naya Rivera went missing at Ventura County's Lake Piru and her young son was found alone on a rented boat, authorities announced Thursday morning. According to the Ventura County Sheriff's Office, the 33-year-old Rivera is presumed dead in a tragic accident after a boating and swimming excursion that began about 1 p.m. Wednesday. READ MORE: