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Troubled actress Heather Locklear landed in a psych ward over the weekend after threatening to shoot herself because she thought her fiancé was cheating on her, according to sources and a report Monday.

The former “Melrose Place” star was so manic and out of control at her Thousand Oaks, Calif., home that she allegedly went after her parents at one point as they attempted to calm her down.

“[Her father] tried to help her, but she, in turn, choked her mom and hit her dad,” a source told Radar Online of the Sunday incident.

According to the incident’s 911 tape, Locklear’s mother told the emergency operator that her 56-year-old daughter was suicidal and “looking for a gun to shoot herself.”

“She does not have access to any weapons,” the 911 dispatcher relays to responding cops, referring to Locklear. “She is agitated and violent.”

Sources told Radar that the actress was “going nuts” because she thought her fiancé, Chris Heisser, was cheating on her.

The two had been fighting since Friday, and Heisser was forced to send Locklear’s daughter, Ava, 20, out of the house as a result of her mom’s unhinged behavior, a source said.

“Chris was worried for Ava’s safety and asked her to leave,” the source explained. “He thought she shouldn’t be there to see her mom like that and didn’t want her to be in harm’s way.”

A representative for the Ventura County Sheriff’s Office told Page Six that deputies responded to a call on the block where Locklear owns a home around 3:50 p.m. Sunday.

Although they could not confirm Locklear’s name, the rep said someone was transported to an area hospital and that no crime had been committed.

“She was determined to be a threat to herself and others,” a law-enforcement source told Radar. “Even though she wasn’t placed under arrest, Heather was handcuffed while on the gurney being transported to the hospital.”

A source told Radar on Monday that she was still in the hospital.

Locklear has a lengthy past with the law and has done several rehab stints for alcohol abuse.

In February, she was busted for alleged domestic violence during a fight with Heisser. The charges were dropped in March.

Locklear entered rehab for the fifth time in January 2017. She told Page Six at the time, “I am feeling great and am taking steps to enrich and better my life.”

A rep for Locklear did not return a request for comment.