Sarah Mulvey died of an overdose of drugs, which she had stockpiled during her stay in the rehab centre, a coroner's court was told. The Channel 4 producer was undergoing "systemic bullying" in the office which is believed to have led to her death.

Mulvey had undergone treatment at the Causeway Retreat for the stress and difficulties she had experienced while working at the Channel. But she went into a severe decline at the clinic, which specialises in "executive stress" management, and is believed to have stockpiled the drugs, which consequently led to her death.

However, her father, Dr. Christopher Mulvey, said at her inquest at St Pancras Coroners Court on Tuesday that Miss Mulvey "loved her job" as a commissioning editor but was "bullied systematically by her managers" until she could no longer cope.

"She was working absolutely full pelt. She was an extremely hard worker because she loved her job," the Telegraph reported her father as saying.

Sarah Mulvey had mentioned the year-long bullying to clinicians and it "potentially led to the circumstances of her death," said Paul Spencer, representing the Mulvey family.

The inquest into her death was adjourned until early next year for further investigations including access to the prescription drugs in the clinic. The 34-year-old Oxford graduate and television producer was discovered dead in her two-bedroom flat in Hampstead, north London, on Jan. 28, 2010.

Mulvey, who joined Channel 4 in late 2006, was responsible for commissioning programmes for "Cutting Edge," the network's flagship documentary series, according to the Telegraph.