Following an Old Bailey trial, Muzyka, 34, from New Malden, south London, was found guilty of murder and possession of a blade and was jailed for life with a minimum term of 30 years.

Investigators found information on his mobile phone showing he had become fixated with spyware, masks, knives and human anatomy.

He had searched these topics repeatedly and had 10 images of spyware, 44 of masks, 186 of the chest and heart and 261 knives.

The placement of the stab wounds showed evidence of his research as they were calculated to cause the most damage.

Muzyka took photographs of Hoisan as she lay dying, then plunged the knife into his own stomach after a man she had been on a date with ran out to alert the police.

Previously, the court heard how Hoisan, known as Lina, had previously been in a relationship with the defendant for several years and had reported him to the police for violence, harassment and stalking, securing a non-molestation order.