A "ferocious" killer, who tried to decapitate his girlfriend in a "narcissistic rage", has been jailed for at least 20 years.
Alin Apopei repeatedly threatened to kill 25-year-old sex worker Denisa Silmen, boasting that he would get away with it by pretending to be mad, the court heard.
In July 2015, Silmen's mobile phone was recording sound as Apopei stabbed her in the neck and chest, killing her, jurors heard.
The woman was found dead at the flat they shared in east London. She was partially naked and had suffered "horrendous injuries".
The jury at the Old Bailey rejected Apopei's defence of mental illness, finding him guilty of murder. The victim suffered 62 injuries.
Judge Gerald Gordon QC told Apopei: "You killed her because you could not face the fact she was finally leaving you."
Previously before the attack, the defendant had told Silmen: "If you will leave me I shall kill you. If I go to prison I will pretend I am mad, they will put me in hospital and I will get free from there because I have lots of money."
Just one month before the murder, the court heard, Apopei also threatened her and a friend, saying: "One day I kill you both."
Following his arrest, Apopei is said to have behaved "erratically", often laughing hysterically then becoming aggressive.
He described his girlfriend as "a witch" and paced around his cell ranting about devil worship, the court heard.
Psychiatrists had differing opinions on whether Apopei was mentally ill and it was left for jurors to decide whether his responsibility for the killing was diminished.