Glee star Naya Rivera is missing after her four-year-old son was found alone in a boat on a lake in Southern California, officials say.
The 33-year-old rented the boat on Wednesday afternoon at Lake Piru, north-west of Los Angeles, the Ventura County Sheriff's office said.
It said a search and rescue operation was suspended overnight and "will continue at first light".
Rivera is best known for playing cheerleader Santana Lopez in Glee.
The musical comedy TV series ran on the Fox network from 2009 to 2015.
Rivera's child was spotted by another boater three hours after the actress had taken the boat, CBS Los Angeles reports, quoting the sheriff's office.
It says the boy told investigators that he and his mother were swimming - but she never got back into the boat.
The missing person was later formally identified as Naya Rivera, a Los Angeles resident.
On Tuesday, Rivera posted on Twitter a picture of herself and her son with a caption "just the two of us".