A thug brutally murdered his own mother by kicking and punching her then setting her alight.
William Kelly, 42, doused Catherine Kelly, 71, in petrol then set her on fire shouting “die, die”, a court heard.
Kelly, an off-shore worker, had a history of attacking his mother and now faces life in jail for the heinous crime.
During a disturbing trial, jurors were told how Kelly violently attacked Catherine, leaving her lying face down on the living room floor.
Following the blaze, his only concern was the safety of his West Highland terrier, Poppy.
Jurors also heard how Kelly broke off from the brutal assault to take a phone call, answering in a ‘silly voice’ claiming to be a worker in an Indian restaurant.
After finishing the call Kelly went back and further assaulted his defenceless mother, who always referred to him as “ma boy”.
Jurors took just 90 minutes to unanimously find Kelly guilty of Catherine’s murder at her home in Kilmarnock, Scotland, in February.
A verdict of culpable homicide was open to jurors, but they found Kelly guilty of her murder.
The heartless thug showed no emotion as he was led away to the cells, the Daily Record reports.
Prosecutor Ashley Edwards QC told the jury on Wednesday that they must find Kelly guilty of the which she described as “the stuff of nightmares,” previously telling them the evidence against Kelly was “clear and unequivocal”.
On Tuesday a forensic specialist told how the 71-year-old grandmother had suffered bruising and broken ribs, with second degree burns to 45 per cent of her body.
She also had injuries that were “consistent with kicking and punching”
Lady Stacey heard how an exact cause of death was yet to be determined, with Dr Emma Kemp saying it could have been “a head injury, suffocation or burns, or a combination of all three”.
Fire investigation officer Robert Christie previously told the court how the fire at the home “was deliberate in origin” and there were two separate, unconnected areas of fire in the living room and in the hallway.
Kelly’s former partner, Eleanor Banks, previously told court how he regularly punched and kicked the pensioner, becoming angry if his mother drank, calling her “an old alkie b******”.
Ms Banks said that at the end of 2016, months before she died, Kelly gave his mother the “worst” beating she had witnessed.
Forensic scientist Shirley Chin told jurors how Kelly’s jeans and trainers tested positive for petrol. They were also told how Cathy was so badly burnt, firefighters could not determine her sex.
When asked if he “could tell if it was a man or a woman’, watch manager Gordon Cairns said: “No, her hair was missing and the clothes were kind of burnt.
“When I went to touch them, they just disintegrated.”
Judge Lady Stacey deferred sentence on Kelly until January 10, next year, in order to obtain background reports. At this hearing she will determine the minimum number of years he must serve in jail.
She told the jurors: “What you have had to listen to has been distressing and sad.”