The former nanny of Michael Jackson's three children regularly pumped the singer's stomach to remove a deadly cocktail of painkillers.
Grace Rwaramba, who was abruptly sacked by Jackson in December, also spoke of her fears for the future of the children following his death, and has flown to Los Angeles from London hoping to be reunited with them.
She revealed graphic details about the singer's increasingly desperate final months.
Rwaramba, 42, said he was 'penniless' and sponging off handouts and loans from friends, but was deluded by his 'riches', blowing money on exclusive hotels rather than providing a stable home.
She said the star was addicted to narcotic painkillers.
'I had to pump his stomach many times. He always mixed so much of it,' the Sunday Times reported.
'There was one period that it was so bad that I didn't let the children see him... He always ate too little and mixed too much.'
She said she once appealed to Jackson's mother, Katherine, and sister, Janet, to intervene and persuade him to seek treatment for his addiction, but Michael turned on her and accused her of betrayal.
'He didn't want to listen; that was one of the times he let me go,' she said.
Rwaramba also feared Jackson's London O2 tour had taken its toll on the singer.
She believed that he did not even realise he had signed up for 50 dates.
'Fifty performances! I said, "What are you doing?" He said, "I signed for only ten". He didn't even know what he was signing. He never did.'
Rwandan-born Rwaramba worked for Jackson for more than a decade, first as an office assistant before becoming nanny to his children, 12-year-old Michael Jr, known as Prince, Paris, 11, and seven-year-old Prince Michael II, nicknamed Blanket.
She was finally dismissed in December last year, but claims she returned several times to see the children, making her most recent trip in April.
Rwaramba said she had screamed with shock when she heard of the star's death, while she was at the Swiss home of TV interviewer Daphne Barak.
She told Barak in an interview that her first thought was for the children.
'I'm really distraught for them. Michael hadn't been eating and the kids have been so scared for him.
'Now the youngest has been saying, "Why Daddy? God should have taken me not him".
'I took these babies in my arms on the first day of each of their lives. They are my babies.'
Penniless: Rwaramba says Jackson pictured with daughter Paris this year, had no idea about money and struggled to provide a stable home for his children
She claimed the children had an uneasy relationship with their father, recalling a recent incident when Blanket performed a mini-concert for her of his father's songs.
'I was laughing so hard. Prince and Paris were playing around,' she said. 'It was such a happy moment. Then suddenly Michael walked in and the kids just looked frightened. Michael was so angry.'
She said the children 'hated' being forced to wear masks in public.
'They didn't like them. It wasn't my idea. I hated it as well. So whenever I had a chance I misplaced the masks or forgot to pack them,' she told Barak.
Rwaramba said Jackson did not have a clue about money and fell under the influence of extremist sect, the Nation of Islam.
She said the sect told him the house Jackson had in Los Angeles - after Neverland was sold - cost £60,750 a month in rent.
But when Rwaramba checked with real estate agents, rent should not have cost more than £15,000.
She revealed how shortly before his death, Jackson was forced to sleep in the New Jersey basement of one of his former employees.
The fate of Jackson's children is unclear with reports raising the possibility of a custody battle involving Debbie Rowe, the biological mother of his two eldest offspring.
Meanwhile, a person close to the situation says Michael Jackson's mother has chosen one of the singer's longtime lawyers to represent the family's legal interests.
Katherine Jackson has selected L. Londell McMillan, who has represented Jackson in several cases in the past, said the person, who requested anonymity because the matter is private.
Since Jackson's death on Thursday, the family has expressed its concern about whether Jackson had a will, and who was advising him in his final days.
Michael Jackson's body could be displayed in a glass coffin.
