A violent thug who beat his lover's husband to death in a brutal attack called her up and said: "I've killed your husband."
Ralph Goldie, 40, hurled Jeremy Paradine down the stairs before stamping on him, leading to head injuries from which the victim never recovered.
Goldie was handed a life sentence at Glasgow High Court, and will have to serve a minimum of 14 years in jail.
Judge Lord Arthurson said the evidence presented to the court during the trial had been "disturbing".
Jeremy Paradine, 45, still lived with Maryanne Paradine, while she maintained a relationship with Goldie. Paradine allowed his wife and her lover to stay with him in Cambuslang, a town to the south-east of Glasgow, after she had become homeless.
The two men had been at the flat of a mutual friend, Martin McQueenie, in Cambuslang on the day of the murder in January.
McQueenie told the court he heard a noise "like rumbling going down the stairs".
He said he rushed out to find Jeremy Paradine lying at the bottom of the stairs and Goldie standing near the top of the flight.
McQueenie told jurors Goldie said: "Just f****** leave him."
McQueenie was then attacked by Goldie and ended up lying beside the murder victim.
Maryanne Paradine said Goldie had called her to say: "'I've killed your husband.'"
Goldie, who has previous convictions for violence, was sentenced today (1 December) after being found guilty at a trial in September.
A victim impact statement by Jeremy's mother was read to the court in which she said her son's life had been "needlessly cut short" by "senseless violence".
She added: "A parent never expects to outlive their child."