Martin Short emotionally addressed the sudden death of his daughter, Katherine.

“It’s been a nightmare for the family,” the “Only Murders in the Building” star told “CBS Sunday Morning.”

“But the understanding [is] that mental health and cancer, like my wife’s, are both diseases, and sometimes with diseases they are terminal,” he added, referring to his late wife, Nancy Dolman, who died in 2010.

“And my daughter fought for a long time with extreme mental health, borderline personality disorder, other things, and did the best she [could] until she couldn’t,” Short, 76, added.

Katherine tragically died at the age of 42 on Feb. 23.

“It is with profound grief that we confirm the passing of Katherine Hartley Short,” a spokesperson for Short told Page Six on Feb. 24.

“The Short family is devastated by this loss, and asks for privacy at this time. Katherine was beloved by all and will be remembered for the light and joy she brought into the world.”

Katherine was found dead with a self-inflicted gunshot wound at her Los Angeles home.

The Los Angeles Fire Department told Page Six that they responded to a shooting at a Hollywood Hills address around 6:40 p.m.

According to TMZ, law enforcement found a suicide note, though it’s unclear what was written.

Short had Katherine, along with sons Oliver Patrick, 40, and Henry Hayter, 36, with Dolman.

The social worker had a service dog named after singer Joni Mitchell to assist with “mental illness.”

Her neighbors described her as friendly, though they noted she kept mostly to herself.

Short is no stranger to experiencing family tragedy. His older brother David died in a car accident when he was 12 years old, and he later lost his mother to cancer when he was 17 years old. His father died from complications of a stroke just two years after.

If you or someone you know is affected by any of the issues raised in this story, call or text the Suicide & Crisis Lifeline at 988.