Miss Mathurasingh met Bristol while working in Trinidad
A woman was stabbed repeatedly by her ex-lover after he saw a picture of her with her new boyfriend on Facebook.
Paul Bristol, 25, was found guilty at the Old Bailey of murdering Camille Mathurasingh, 27, at her east London home in April 2009.
The IT technician, who lived in Trinidad and Tobago, flew to London within two weeks of seeing the picture and killed the accountant.
Bristol, who denied murder, is expected to be sentenced later this month.
The court heard he could not accept "it was over" and had come to "win" his girlfriend back.
Bristol, who worked for the Trinidad and Tobago Ministry of Administration, and Miss Mathurasingh met during the three years she worked for PricewaterhouseCoopers in Port of Spain, Trinidad.
'He looked evil'
After her return to London in 2008 their relationship continued through emails and telephone calls, but last year she began having doubts about their future and decided to go out with her new boyfriend.
Simon Denison QC, prosecuting, said: "It would appear she tried to bring about the end of her relationship with this defendant gently and did not tell him about her new boyfriend.
Bristol flew to London two weeks after seeing the Facebook picture
"He found out when he saw pictures of them together on Facebook.
"He would say he could not accept it was over and he decided to come here to see if he could win her back."
The day before her murder, she told her sister Nadine that she had to flee her home as Bristol had arrived from Trinidad, but she saw him following her.
Nadine said of the conversation: "She said she looked into her rear-view mirror. She said he looked evil."
Metropolitan Police said they caught Bristol when he fled on foot after a collision between his car and a black cab in east London.
When stopped he had blood over his face and clothes and admitted killing his girlfriend. He claimed he committed manslaughter through provocation.
Following the verdict, the victim's mother Indra Mathurasingh said: "Justice has been served for Camille. She was snatched from us and we are empty without her."