A woman who carried out the "horrific" hit-and-run murder of a mother-of-three was jailed for life today.
Rona MacKenzie will spend at least 15 years behind bars for mowing down 39-year-old Margaret Borris in a car as she walked with her son in Paisley, Renfrewshire.
MacKenzie, 46, of Paisley, left her victim lying on the ground in the town's King Street on July 7 last year before trying to dispose of the car.
The killer had denied the charges against her, but a jury found her guilty of murder and attempting to defeat the ends of justice after a trial last month.
Judge Lady Dorrian told MacKenzie that "having regard to the deliberate and horrific nature of the offence", she must spend at least 15 years behind bars before being considered for release.
The trial at the High Court in Glasgow heard that both women had been partners of the same man, James Wandrum, at different stages in his life.
The jury was told that the women fell out in the weeks before the incident after a dog belonging to Mr Wandrum, which Ms Borris had been looking after, was run over.
When MacKenzie saw Ms Borris by chance on July 7, she lost her temper and drove at her.
The trial heard how MacKenzie drove at Ms Borris, from Irvine in Ayrshire, after seeing her walking with her 20-year-old son Paul Wandrum.
The university student told the trial how his mother was dragged under the wheels of the car and left dying on the street as they made their way to cash in postal orders for his grandmother.
He fought back tears as he told the court: "That was no accident."
Witnesses told the court that the driver was "as cool as a cucumber" and "emotionless" after the incident.
Ms Borris was taken by ambulance to the Royal Alexandra Hospital in Paisley. By the time her son arrived with his grandfather she had died.
The trial heard that MacKenzie boasted about the killing in a phone call to her son.
The jury went on to unanimously convict MacKenzie of murdering Ms Borris by repeatedly hitting her with the car, and by repeatedly driving over her body while she was lying on the ground.
They also found that she had previously shown malice and ill will towards the victim.
Lady Dorrian, sitting at the High Court in Edinburgh today, said background reports suggested MacKenzie has since expressed remorse for what happened.
"If that is so, it is in sharp distinction to your actions on the day in question and to your attitude thereafter as disclosed in the telephone conversation with your son, which was played to the court and which disclosed a callous rather than a remorseful attitude."
She went on: "There is only one sentence for someone who has been convicted of murder and that is a sentence of life imprisonment."
Fixing the minimum term MacKenzie must serve in prison, the judge said: "Having regard to the deliberate and horrific nature of the offence, the previous malice and ill will, your prior record and all the factors advanced on your behalf by counsel and the information in the social inquiry report, I propose to fix the punishment part at 15 years."
MacKenzie was also convicted of attempting to defeat the ends of justice by dumping the car in a reservoir in Beith, Ayrshire.
"After the crime, you tried to get rid of the murder weapon, namely the motor car, with the intention of suppressing evidence and defeating the ends of justice," said Lady Dorrian.
"This too is a serious offence."
She ordered MacKenzie to serve a concurrent sentence of five years on that charge.
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