According to the Ventura County Sheriff’s Office, Rivera came to Lake Piru in Ventura County, California, north of Los Angeles, around 1 p.m. PST on Wednesday.
She rented a boat, and she and her son were seen going out on the lake together, Sheriff’s Capt. Eric Buschow said in a news conference.
About three hours after they left the dock, another boater out on the lake discovered a boat drifting with the child asleep on board.
The boat was found in the area called “The Narrows” on the north end of the lake.
Authorities were notified and they began search and rescue efforts from the air and with a dive team.
Buschow said it was difficult to get information from the child, who told them they went swimming, but his mother didn’t get back on the boat when he did.
The child had a life…