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Glee stars Heather Morris and Harry Shum Jr. urged fans to pray for their former castmate Naya Rivera, after she went missing and is presumed drowned during a boating trip with her minor son on Wednesday.

Heather wrote on her Instagram Story: "We need all the prayers we can get to bring our Naya back home to us. We need your love and light."

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Naya was reported missing after she rented a pontoon boat and went out on the Lake Piru reservoir with her four-year-old son Josey Dorsey around lunchtime Wednesday.

When the boat was overdue to return, lake staff went searching for it. They found Josey asleep on board the boat. Naya was nowhere in sight.

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Josey told officers that his mom went for a swim with him but she never returned to the boat.

Authorities will renew their search and rescue mission "at first light" on Thursday morning after suspending the search around midnight.

Captain Eric Buschow, a spokesperson for the Ventura County Sheriff's Office, told reporters that Naya was "presumed drowned", explaining: "We're going on the belief that she did go in the water, and we've not been able to locate her. This may well be a case of drowning. This is a big reservoir, it's deep, these kinds of things happen."

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Naya's fans pleaded with authorities not to suspend the search for the 33-year-old actress.

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Josey's father is Naya's ex-husband Ryan Dorsey, whom she divorced in 2018 after four years of marriage. Naya was arrested in 2017 for assaulting Ryan.

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Naya was born on January 12, 1987 in Santa Clarita, California. She began her career as a child actress and model, appearing in national television commercials before landing a role on the CBS sitcom The Royal Family at the age of 4. She is pictured above at age 22.

She got her big break as Santana Lopez on the long-running Fox television musical series Glee from 2009 to 2015.

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Naya, pictured 3rd from left, on location in Manhattan's Washington Square Park with Glee castmates (L-R) Chris Colfer, Kevin McHale, Lea Michele, Dianna Agron, and Amber Riley in 2011.

She made her feature film debut in the horror flick At the Devil's Door (2014), and starred as Blanca on the third season of the Lifetime television series Devious Maids in 2015.

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Naya signed a record deal with Columbia Records in 2011 and released a single, "Sorry", featuring her ex-fiancé, rapper Big Sean, in 2013.