Jason Marshall , aged 28, tied Peter Fasoli to his bed, naked and threatened him with a large hunting knife in order to obtain his PIN numbers.
After withdrawing around £780 in cash from Mr Fasoli's accounts, Marshall, who was pretending to be a policeman, smothered his victim with cling film before burning his one-bed Northolt bungalow to cover his tracks.
The jury took just one hour to return the guilty verdict, and Jason Marshall did not react as the verdict was delivered.
An inquest into Mr Fasoli's death in January 2013 had returned a verdict of "accidental death" from the fire at his home on Ruebens Road.
The murder investigation was launched two years later after Mr Fasoli's nephew discovered gruesome CCTV footage of his uncle's murder, which was shown to the jury at the Old Bailey .
Marshall had met Mr Fasoli through gay dating site, Badoo, and had previously marketed his escort services on apps like Grindr.
Three week's after Mr Fasoli's murder, Marshall murdered 67-year-old Vincenzo Iale in the victim's flat in Rome.
Shortly afterwards he met 54-year-old Umberto Gismondi and tortured him to extract money from him.
Italian Courts found him guilty of murder and attempted murder and jailed him for 16 years, but he was brought to the UK to face charges for Mr Fasoli's murder.
At the Old Bailey on Wednesday August 9, Marshall was found guilty of murder and arson.
During the trial, details emerged of Marshall's obsession with impersonating law enforcement.
He turned up to Mr Fasoli's home on January 6, 2013 dressed as a policeman, complete with handcuffs, police utility belt, holster and latex gloves.
On the pretext of bondage sex, he "arrested" Mr Fasoli "for being a spy" and interrogated him, threatening to cut his tongue if he did not hand over his PIN numbers.
Jurors were shown the footage of Mr Fasoli, bound and naked, begging for his life.
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