Lisa Rinna has revealed her father died by assisted suicide.

The 61-year-old former 'Real Housewives of Beverly Hills' star said her dad Frank, 94, was in such agony in 2016 he chose to end things his own way.

She revealed on the 'Let's Not Talk About the Husband' podcast, which she hosts with her husband, Harry Hamlin, 73: "You want to support your loved ones. You want to support what they want to do, but you're going to watch your parent kill themselves."

Lisa told how her dad chose to end his life through assisted suicide under Oregon's Death with Dignity Act.

Her husband explained to listeners Frank's "quality of life had diminished" to the point where he no longer wished to continue living.

Oregon law permits residents with terminal illnesses to make the decision to die on their terms, provided certain requirements are met.

Lisa said about the emotional conflict she felt as her father made this decision: "He was in pain, and really unhappy with his life."

Despite her internal struggle, Lisa and her half-sister ultimately respected Frank's wishes.

She added: "He wanted it so badly, and my mom signed off on it."

The assisted suicide process, Lisa added, took between three to six months to complete.

Frank needed two doctors to sign off on his condition, which they did.

His family chose to carry out the procedure in a hospice setting, with the assistance of a "death doula" and medical professionals.

Lisa described the final moments with her father as "beautiful", despite the sadness of the situation.

She said: "We were playing some beautiful, also some yoga type beautiful music.

"But then, you mix it in the orange juice. It tastes like s***. It's sour. But he's got to drink it down."

Lisa added about her dad's life ebbing away: "It doesn't happen right away. It took 45 minutes."

After Frank drank the mixture, he peacefully drifted off to sleep, as the death doula kept morphine on hand in case the process needed to be accelerated.

Lisa, who was filming 'RHOBH' at the time of her dad's death, admitted she chose not to speak publicly about her father's death for some time.

She added: "I think it was just too painful."