The son of a Camden Council accountant has been jailed for life for stabbing her to death in a frenzied attack before dressing up in a woman’s pink tracksuit to try to fool neighbours into thinking she was still alive.

Nigerian born Emmanuel Kalejaiye, 22, stabbed his mother Tolu Kalejaiye’s upper body forty times.

In a case with strong echoes of the 1960 Alfred Hitchcock film, in which killer Norman Bates impersonated his dead mother, Kalejaiye then dressed up as her to allow himself time to dispose of her body.

Ruling that Kalejaiye must serve a minimum term of 15 years three months before he can even be considered for parole today (Friday) Judge Christopher Ball QC said: “This was an horrific killing. You drew up plans to kill her, over weeks, if not months, and to dispose of the body.”

The judge told Chelmsford Crown Court that mental illness played a part in the killing and said Kalejaiye would receive treatment in jail.

A jury convicted the Essex University student of manslaughter by reason of diminished responsibility, due to mental health issues.

Since then he has been in a secure hospital for psychiatric assessment to decide whether his mental condition rendered him a danger to the public. His counsel,

Christian single mother Tolu who worked as an agency employee at the council, suffered 40 wounds and died from blood loss when two arteries in her neck were severed as she was about to go to work on September 26 last year.

Kalejaiye, who had been studying molecular medicine and biochemistry at the University of Essex, claimed five masked men broke into their home in Wethersfield Way, Wickford, Essex, and killed his mother as they forced him to stab her.

He also ran a separate, partial, defence of diminished responsibility because he had been diagnosed as a paranoid schizophrenic and had a depressive disorder at the time.

The prosecution alleged that Kalejaiye disliked his mother, who was described during his trial as strict, stubborn and with an explosive temper, and that he “meticulously” planned to kill her.

The jury heard in the weeks before her death he bought several pairs of rubber gloves, knives, a pink woman’s tracksuit, a beanie hat and a snood.

He laid cardboard and plastic down on the floors of their modern detached house and wore the pink outfit to move his mother’s silver Mercedes car to deceive neighbours that she had left for work, the jury was told.

Notes were found in a locked suitcase in the defendant’s bedroom in his handwriting detailing a “murder plan”, which included learning to walk in high heels.

But Kalejaiye was unaware that his mother had rung her boyfriend, married man Leo Shogunle, and the chilling last four minutes of her life were captured on a voicemail.

She was recorded as she screamed: “Help me, oh don’t kill me. I’m not worth killing. Talk to me. Go now. I beg you in the name of Jesus. Help. In the name of Jesus, in the name of Jesus.”