Details of heartbreaking notes left for Jim Carrey by his ex-girlfriend before she took her own life have emerged, as a coroner ruled her death was suicide.

The body of Irish make-up artist Cathriona White, 30, was discovered at her home in Los Angeles in September.

A report by the Los Angeles county coroner’s office found she died after taking a lethal cocktail of prescription drugs.

Cathriona WhiteCathriona White (via Twitter/@littleirishcat)

Cathriona and Jim had broken up a week before her death and she left two notes for the Hollywood star in which she said she was “just not for this world”, the report stated.

“I’ve spent 3 days now in disbelief that you’re not here,” she wrote. “I can go on broken-hearted and try to put the pieces back. I could, I just don’t have the will this time.

‘I’m sorry you felt I wasn’t there for you. I tried to give you my best part.”

Jim Carrey joins mourners behind the coffin of ex-girlfriend Cathriona White Jim Carrey joins mourners behind the coffin of ex-girlfriend Cathriona White (Niall Carson/PA)

Cathriona signed off the note, which was found in a sealed envelope, with the word “Dewdrop”, the report said.

A second note, also written to “Jim”, asked for “his people” to sell her belongings and give the money to her family.

“I don’t really know about burial or that sort of thing. You are my family so whatever you choose will be fine,” she wrote. “Please forgive me. I’m just not for this world.”

Jim CarreyJim Carrey helps carry the coffin of ex-girlfriend (Niall Carson/PA)

Cathriona was discovered by two of her friends and Jim’s personal assistant Nicole Montez on September 28 after they went to her home to check on her.

According to the report, Jim had sent a text message to Cathriona a day before her body was found asking where his painkillers had gone from under his sink.

It is understood Jim was referring to the prescription drugs Ambien, Percocet and Propranolol , made out to the name “Arthur King”, which were found at Cathriona’s home, the report said.

Jim Carrey(Niall Carson/PA)

Cathriona’s cause of death was given as “multiple drug effects” after a toxicology report discovered propranolol, zolpidem, oxycodone and oxymorphone in her system.

The last activity on Ms White’s phone was a three-minute FaceTime call with Jim four days before she was found, the coroner said.

Her friend Dennis Bradshaw told investigators she was “happy and upbeat” but would get “really down” and her friends would not hear from her for a while.

Jim CarreyJim carried the coffin at Cathriona’s funeral (Niall Carson/PA)

Cathriona told Dennis she was missing her family in Ireland and she was “madly in love with Jim” but their relationship was a “rollercoaster”, he said.

“She tied her identity to him and if she felt he (Jim) was slipping away, she would become depressed,” the report said.

Jim was “reclusive” due to his celebrity status and Cathriona would often stay at his home, Dennis told investigators.

Another friend, Jenny Burpee, said Jim had first “unexpectedly” broken up with Cathriona in 2013 and she had “not eaten or slept for a year afterwards”. Jenny said she believed Cathriona had previously taken an overdose of pills around two years earlier.

Jim carried the coffin at Cathriona’s funeral in the village of Cappawhite, Co Tipperary, in October as she was laid to rest beside her late father. The actor described Cathriona’s death as like being “hit with a lightning bolt”.

Cathriona had moved to Los Angeles in 2009 and took roles as an extra on television before working behind the scenes. The report states that Mark Burton confirmed he and Cathriona were legally married at the time of her death.