A son killed his father by triggering a fatal heart attack in a "savage" bottle attack.
William Cameron struck his father Alexander Cameron 19 times with a bottle after a drunken argument between the pair.
The 27-year-old attended a friend’s house after the attack and said "I think I just killed my father."
Cameron was originally charged with murdering the but the Crown accepted his guilty plea to the reduced charge of culpable homicide.
The High Court in Glasgow heard on Wednesday that the pair had been arguing about the 51-year-old Mr Cameron’s treatment of his wife.
When later caught by police, Cameron claimed that when he last saw his father at the house in Tannahill Road, Paisley, he was alive.
Cameron was jailed for seven years and one month for the attack on August 3, 2011.
Prosecutor Jonathan Brodie QC told the court that the "primary cause of death" was heart disease.
Defence QC Ian Duguid said: "The accused had witnessed violence in his family home. His father was jailed for an assault on his mother when he was just eight or ten. He realises what a devastating thing he has done."
The court was told that Cameron's mother and father had been estranged for many years. Temporary judge Sean Murphy QC told Cameron: "You carried out a savage attack on your own father. It is clear you inflicted no fewer that 19 injuries to his head and neck with two broken bottles.
"There were some defensive injuries that showed your father tried to defend himself. The attack was a sustained one and triggered a fatal heart attack."
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