An ex-soldier who brutally murdered his daughter's partner is facing life behind bars.
Daniel Langman strangled Anthony Collins, 28, during a horror attack at his flat after losing control when he found his home in disarray.
The 48 year-old later went on to confess to his mother that he had done "something stupid".
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The Northern Ireland veteran had denied murder during a trial at the High Court in Glasgow.
He found guilty while the jury found co-accused Anthont McGovern, 36, not proven of the same charge.
Langman will learn the minimum he will spend behind bars next month.
The court heard how Langman did not like Mr Collins - known as Tony - and believed he was bad for his daughter Chloe.
He admitted he had barred the victim from his flat, but insisted he "definitely" meant no harm towards him.
Langman said he came home on the night of the killing and found his flat in Port Glasgow "obliterated" on May 16 2021.
He spotted Mr Collins there, claimed he was hit before hurling abuse at his daughter's lover.
Langman then went on to smack Mr Collins up to four times with his guitar.
He went on to punch him before claiming his mind went "hazy" about what then occurred.
Langman told jurors: "I remember Anthony McGovern screaming at me. I realised that I was on top of him (the victim) strangling him."
He admitted to his KC Donald Findlay that he "lost control".
Prosecutors stated Mr Collins was choked by a cable being tightened around his neck.
He was also said to have been struck with the guitar, an iron, metal poles, a plastic tube and a screwdriver.
Langman said he wrapped the stricken victim in a duvet, but denied that was to cover the horror of what he had done.
He told jurors he had not meant to kill the man.
But, the trial heard how Langman called his mother Jennifer Goodwin after the killing.
She described him as upset and crying.
The 67 year-old said: "He told me that he had done something stupid.
"He said he went home and a man was in his flat. They got into a fight and he thought things went too far.
"He told me that he was going to hand himself in to the police station."
Lord Fairley remanded Langman in custody and deferred sentencing for reports.
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