A delivery driver carried out a "horrific and brutal" fatal attack on a woman after her daughter called off her wedding to him.
Robert Edwards, of Tipton, West Midlands, killed Sylvia Smith, 59, four days after the wedding was cancelled.
Her body was found at her home in Erdington, Birmingham, when her daughter came home from work on 7 May.
Edwards was found guilty of murder after a trial at Birmingham Crown Court and will be sentenced on Wednesday.
Mrs Smith's family said the verdict was justice for Sylvia, but not a time for celebration.
"We have lost a much loved mother, sister and aunt and now have to live our lives without Sylvia, knowing the horrendous details of how she died," they said.
Police said: "This was a horrific and brutal attack by Robert Edwards, who at one stage was a prospective son-in-law."
During the trial the court heard Mrs Smith's daughter, Samantha, had been in a long-term relationship with Edwards, of Monins Avenue, since 2000.
They met at Birmingham's Longbridge car plant, the court heard, but the relationship eventually broke down and Miss Smith, 36, left Edwards in April to move back to her mother's home in Mere Road.
She later cancelled their wedding, which had been planned for August, after Mr Edwards threatened to commit suicide, the court was told.
He went to Mrs Smith's home and, after he had been let in, attacked her leaving her with knife wounds and other injuries caused by fist, foot or both.