A 17-year-old boy has been found guilty of murdering a young woman, apparently for falling in love with the wrong man.
Samaira Nazir, 25, was stabbed 18 times and had her throat cut at her family's home in Southall in April 2005.
She was killed after asking permission to marry an asylum seeker from Afghanistan, the Old Bailey had heard.
The guilty youth cannot be named for legal reasons. The jury is still considering a verdict on Ms Nazir's brother, Azhar, 30, who denies murder.
The 17-year-old was remanded in custody for sentencing.
Judge Christopher Moss told him he would receive a life sentence, but he would need to see reports before deciding on the minimum term.
Prosecutor Sally Howes QC told the trial Samaira's family wanted her to marry within the Pakistani family circle.
But she met Salman Mohammed in 2000, shortly after he arrived in the UK in the back of a lorry.
He had made his way to Mr Nazir's shop in Southall Broadway and the two men became friends.
He also fell in love with Miss Nazir - but the two kept their relationship a secret, the trial heard.
But the situation erupted when she revealed she wanted to marry him - the court heard her brother thought Mr Mohammed was "only after the family money".
Miss Howes said: "Following a heated argument about her relationship with Salman [Mohammed], she was attacked and killed.
"It would appear she lost her life for loving the wrong man.
A neighbour heard the screams and knocked on the door, which was opened and a bloody left arm appeared, the court heard.
Miss Howes told jurors Miss Nazir appeared to be pulled back into the house by her hair.
When police arrived, she was dead, with a silk scarf tied tightly around her neck. Her brother said he had been in another part of the house at the time of the stabbing.
The jury has retired for the day and will resume deliberations on Mr Nazir on Friday.