A heartless man faces a life sentence after being found guilty of kicking or stamping on a confused 71-year-old woman after she mistook his seaside home for a B&B.
David Redfern, 46, refused to call an ambulance as frail Margaret Barnes lay dying after dragging her outside the huge townhouse by her ankles.
The IT worker "sounded like a raving lunatic" on the night she died, a court heard before he was convinced.
He had denied murder or manslaughter, but today a jury at Caernarfon Crown Court took 14 hours and 30 minutes to convict him of murder.
Adjourning sentencing until Friday, Mr Justice Bourne told him: ”You are remanded in custody.
"You have been advised what the sentencing decision will be.”
In his closing speech, prosecutor Michael Jones KC added that Margaret Barnes, of Birmingham, died because of the "violent and cruel" actions of Redfern.
Mrs Barnes had had the misfortune of entering the wrong building and encountering a 6ft 1 man with anger issues, the barrister remarked. She’d been found in his bed.
Home Office pathologist Dr Brian Rodgers found she had suffered blunt force trauma.
The trial had heard cruel Redfern was surprised that intoxicated Mrs Barnes mistook his home for her B&B but acted "out of all proportion" in hauling her outside by her feet.
Jurors were told the man, who is six feet one inch tall and weighed 21 stone, had deliberately and forcefully kicked or stamped on Mrs Barnes on Marine Parade, Barmouth, in an “unjustified and gratuitous” attack.
Mrs Barnes, who weighed seven and a half stone, had been visiting friends in Barmouth last year.
During his trial, Junior prosecutor James Coutts read a statement from neighbour Lynn Hynes, who said she heard the defendant shouting inside his home.
She said it was a "common occurrence" for him to be shouting at his partner Nicky Learoyd-Lewis, but that night she said he "sounded like a raving lunatic".
The prosecution claim that, soon afterwards, Redfern dragged Ms Barnes outside and her suitcase was thrown after her.
Ms Hynes said she went out and found Ms Barnes outside Belmont House - Redfern's home - in a "foetal position" and helped prop her up against a wall.
But she was said to be "flopping to her right".
Ms Hynes, a former nurse and Army first aider, asked Ms Barnes whether she had pain, and she said: "Chest." Asked why she had pain, Ms Barnes said "beaten up".
She rang a 999 call handler and told her the patient was "going to die".
Ms Hynes said: "The call handler got a bit panicky and advised me to start chest compressions."
The colour of Ms Barnes' face turned from a "horrible creamy colour to grey" and she died, said Ms Hynes.
Residents gathered to help and another neighbour, Zelanie Hart, told the court the defendant was "angry and fuming" and said he felt "violated".
