A vulnerable pensioner was murdered by her ‘deviant’ son-in-law in a horrific sex assault at her Neasden home, a court heard.

Amoe Stevens, 64, of Cairnfield Avenue, bled to death after suffering severe internal injuries at the hands of 32-year-old Mohamnud Yusuf, it is claimed.

The Old Bailey heard Yusuf allegedly tried to cover up the attack by telling the victim’s carer that the bloodstains were really curry sauce.

When police arrived two hours later he appeared unconcerned and denied knowing how she suffered the fatal wounds, jurors were told.

Examination of his mobile phone and computers revealed an obsession with painful and humiliating sexual violence and pornographic videos showing violent rape, gang rape and incest, the court heard.

Jurors heard there was a link between this interest and the injuries suffered by Mrs Stevens who was found in her chair at around 8pm on 18 October last year.

She died in hospital later the same day and a post mortem revealed she had died of haemorrhaging.

Prosecutor David Jeremy QC said: “Why this defendant or anyone would have inflicted injuries like these on their defenceless mother-in-law is not a question to which the prosecution can provide you with a complete or satisfactory answer.

“But clues may be found in the contents of his phone and computers.

“When you put alongside each other what must be a clearly deviant interest this defendant had in pain and degradation of women and what happened to Mrs Stevens, there is a relationship between them.

“The effect of that is that it makes it more likely that it was this defendant who would have carried out that assault.”

Yusuf, also of Cairnfield Avenue, denies murder.

The trial continues.