A woman stabbed a grandfather to death 12 years after she first attacked him with a knife.

Seka Ritchie smashed a bottle over Alexander Duncan's head and stabbed him in the heart after a chance encounter.

Ritchie was ordered to serve at least 17 years in jail for the murder of Mr Duncan, known as Addy, at his home on Primrose Street in Leith, Edinburgh.

She had previously been jailed for 12 months for a life-endangering attack on him.

Lord Glennie said: "On the evidence I have heard this was a vicious, unprovoked attack on a vulnerable man.

"You have a bad record for violence, including a conviction for assaulting Addy Duncan to the danger of his life."

Mr Duncan's partner found his body surrounded by broken glass in the living room of his Leith flat three days after he was killed.

Ritchie, 32, had denied murdering the victim on April 16 last year but was found guilty by a majority verdict by a jury at the High Court in Edinburgh.

Unemployed Ritchie, of Muirhouse View, Edinburgh, told police she had never been in a relationship with Mr Duncan.

Shortly after meeting him at the age of 18, she stabbed him in the leg at another Leith property.

Ritchie said she had been with her girlfriend Tracey McLean on April 16 last year when she spotted Mr Duncan outside the Marksman Bar in Duke Street.

He bought them a drink before they later went to his flat, with the victim buying vodka on the way.

She said he had agreed to let them walk him home, claiming he wanted to make sure he "got home OK".

Ritchie claimed that when she later left Mr Duncan's flat he was fine and did not have any injuries.

She she and her girlfriend departed after a man called "Stevie" turned up at Mr Duncan's home and insisted  she had no involvement in his death.

Blood from the dead man was found on clothing she had worn, however, and her former girlfriend told the court she had seen Ritchie attack Mr Duncan with a vodka bottle.

She said she had left the flat before Ritchie inflicted the 12cm stab wound which killed Mr Duncan.

McLean, 30, had also originally faced a murder charge, which she denied. The Crown accepted her not guilty pleas during the trial.

Police later found letters Ritchie wrote to McLean, which said she would take full responsibility for what happened.

Advocate depute Tim Niven Smith asked a pathologist who examined Mr Duncan's body if the type of stab wound he suffered was survivable and was told: "Essentially, no."

Ritchie was also convicted of attempting to pervert the course of justice in the wake of the murder by falsely claiming to police that a man called "Stevie" had turned up at the victim's flat.

Mr Niven Smith told the court following her conviction that Ritchie had previous convictions which showed "a propensity for dishonesty and violence".

After the verdict, Mr Duncan's daughter, Sharman Wilson, 38, said: "We would like to thank everyone involved in bringing my father's killer to justice.

"Although this does not make up for the taking of his life, it has brought some closure to what has happened.

"Hopefully we can now let my father rest and as a family we can grieve and help each other through this tough time."

Detective chief inspector Martin MacLean, who led the murder inquiry, said Ritchie had betrayed Mr Duncan's friendship and trust.

He said: "For reasons that she alone knows and has refused to divulge, she attacked and killed him in his own home in a manner that, the evidence suggests, was completely unexpected and against which he was unable to offer any resistance.

"This was a challenging and protracted investigation that was compounded by the lies repeatedly told to the police by certain individuals but in particular Seka Ritchie as she sought to cover her involvement in the crime.

"Her conviction is testament to the meticulous and thorough investigation carried out by my team and my thanks go to them for their hard work.

"I also thank Mr Duncan's son and daughter for their patience and assistance during the investigation and hope the conviction is something that helps them deal with what has happened."