Khalid Ashraf strangled his sister after developing schizophrenia following depression after a HIV diagnosis

A mentally-ill KPMG auditor who became depressed after a HIV diagnosis strangled his devoted sister and told police a piece of chicken on his dinner plate was possessed by the devil and told him to kill her.

Sarah Ashraf, 35, went to stay with her younger brother Khalid, 32, fearing he would harm himself, but he throttled her death after suffering a psychotic episode at his Docklands apartment.

Neighbours called police after following a trail of bloodied hand prints from his flat and the killer told police: 'Satan told me to kill her'.

Ms Ashraf, who cared for her brother, became worried about his mental health after he told her the chicken dish was possessed, the Old Bailey heard.

She was helping him move into a new flat when he pounced on her and was killed in a 'fierce struggle' as she tried to fend him off with a kitchen knife.

The court heard Ashraf struggled with being Muslim and gay and he sank into depression after an HIV-diagnosis in 2011 while he was working as an auditor for KPMG.

Ashraf made a series of phone calls to a friend hours before the killing warning that his sister had to die but saying: 'You know that I love her so much.'

He later told police: 'Satan whispers into people's ears and he used manipulation and lies to commit acts' adding: "Satan told me to kill her".'

A court heard neighbours of Ashraf's flat on the Isle of Dogs raised the alarm

Sending him to a hospital for treatment, the Common Sergeant of London Judge Richard Marks QC said: 'This is obviously an extremely tragic case.

'Having regard to psychiatric evidence the prosecution properly accepted your plea of not guilty to murder but guilty to manslaughter by reason of diminished responsibility.

'The basis for the acceptance of that plea was that all psychiatrists involved believe you were suffering from paranoid schizophrenia.'

He said of the victim: 'She tended you like a mother would she had gone to your flat that afternoon it appears to help you with your intended move.

'It appears she expressed concerns to others earlier about your mental health.

'You had said the chicken on your plate had been talking to you. She did not however apprehend that you posed any risk to her but in the event once these discoveries were made in the flat you were taken to a police station and interviewed.

'You said you remembered the incident and had killed your sister. You said: "Satan whispers".

'Three psychiatrists looked at the case and all are of the opinion that the appropriate way for you to be dealt with is a hospital order.

'Your culpability for the killing is very low and in the absence of mental illness you present no risk to others.'

A judge at the Old Bailey (pictured) order Ashraf should be kept in a secure hospital

Ashraf's lawyer Dean George told the court: 'He is historically Muslim though not practicing and also homosexual so he was struggling to come to terms with this. He loved his sister very much.'

Ashram, of Docklands, east London, admitted manslaughter and was sent to a psychiatric facility in east London indefinitely under Section 37 of the Mental Health Act 1983, with a restriction under Section 41.

The order means that he will be detained in a mental health institution until he is deemed fit and no longer a risk to the public.

Detective Chief Inspector Paul Considine of Specialist Crime said: 'The Ashraf family have been devastated by this tragic event. Sarah recognised that her brother's mental health was deteriorating and went to his flat to care for him.

'We will never know what the catalyst was that led to Khalid killing his sister but he and his family will have to live with the loss of their loved one for the remainder of their lives.

'I would urge anyone that is concerned about the mental health of a friend or family member to seek help on their behalf.'