Actress Naya Rivera is presumed dead after her four-year-old son was found alone in a boat on Lake Piru in California on Wednesday afternoon.
The Ventura County Sheriff's Department said that they began searching for a presumed drowning victim at the reservoir at around 1pm.
The Glee actress is said to have arrived at lake and rented a pontoon boat, taking her son out aboard.
At around 4pm, the boat was found with the child inside but the victim was missing and the car still parked at the lake.
Rivera and her son are said to have been swimming in the lake, with only the boy getting back on the boat.
Authorities believe Rivera to be 'presumed drowned' and a search has been launched to locate her body, according to Captain Eric Buschow, a spokesman for the Venture County Sheriff's Office.
A search and rescue dive team and a helicopter with a drone have both been dispatched to the scene to assist in the search.
As of 8pm, a body has not yet been located.
Rivera had just taken to her social media on July 7, sharing a touching photo of her with her son, Josey Hollis. 'Just the two of us,' she said in the post.
Naya welcomed son, Josey Hollis, with then-husband Ryan Dorsey in 2015.
Lake Piru is a reservoir located in the Los Padres National Forest and Topatopa Mountains, created in 1955.
© Associated Newspapers Ltd.