The former Glee actor Naya Rivera is missing and feared to have drowned at a lake in southern California where her four-year-old son was found alone on a rented boat. A search operation at Lake Piru involving more than 80 people – including divers – and helicopters, drones and all-terrain vehicles resumed on Thursday after being suspended on Wednesday night. The 33-year-old actor rented a pontoon boat at about 1pm on Wednesday and planned to go swimming with her son in the reservoir’s recreation area, authorities said. Another boater found her son on the north end of the lake asleep on the boat and wearing a life vest. “We’re going on the belief that she did go in the water and we have not been able to locate her,” Sheriff’s Captain Eric Buschow said at a news conference. “So this may well be a case of drowning.” Rivera’s ID was found on the boat and her vehicle was found in a parking area, authorities said. The boy was safe and healthy and was now with family members. Rivera’s breakthrough role was as Santana Lopez, a cheerleader, in Ryan Murphy’s musical comedy Glee, which aired from 2009 until 2015. Glee was nominated for 32 Emmys and nine Golden Globes during its run. Rivera, who appeared in 113 episodes of the series, was nominated for a Grammy along with her co-stars for the cast’s version of Journey’s Don’t Stop Believin’. There have been occasional drownings in the popular recreation area of the lake – technically a reservoir – about an hour’s drive from downtown Los Angeles. It was shut down on Thursday for the search. Rivera’s ex-partner Mark Salling killed himself in 2018 after pleading guilty to charges involving child sexual abuse images. Salling, 35, who played the character Puck in Glee, was due to be sentenced for the possession of 50,000 child abuse images at the time of his death. Another co-star, Cory Monteith, died in 2013 of a heroin and alcohol overdose. The 31-year-old had struggled with addiction problems, telling Parade magazine in 2011 that he was “lucky to be alive”. Rivera began her career as a child actor on shows including the CBS sitcom The Royal Family, which she joined at the age of four. In 2014 she married the actor Ryan Dorsey, with whom she had her son. Rivera was arrested on suspicion of domestic battery against Dorsey in 2017 but the charges were later dropped. The couple divorced in 2018. Associated Press contributed to this report