Daniel Brown attacked Daryl Nimmo (25) at a flat in Dalry, North Ayrshire in April this year.

The 19 year-old was let go by police just 24 hours earlier having being caught with two knives in Edinburgh.

He was then free to kill Daryl, who he had only recently met for the first time.

The trial took place at the High Court in Glasgow. Picture: John Devlin

Brown later told police how his victim “begged for mercy” as he carried out the savage attack.

The teenager now faces a life sentence after he admitted to a murder charge at the High Court in Glasgow.

Brown will learn the minimum he will spend behind bars next month.

On April 12 – the day before the killing – Brown was held by police in Edinburgh.

He was charged after being found with a knife in his waistband as well as another hidden in his sock.

Prosecutor Owen Mullan said: “He was informed that he would be reported to the procurator fiscal and was left in the care of staff at a hostel where he was living.”

Brown went on to take a taxi from the capital to Dalry to visit his mum’s friend Linda O’Neil.

Linda was in a relationship with Daryl at the time.

Brown claimed he was visiting as he had fallen out with his own girlfriend.

The next day, Brown had a disturbing call with his mum hours before the murder.

Mr Mullan said: “He made a Facebook video call and brandished a machete-type knife threatening to stab people.”

Brown later joined Linda and Daryl at her home.

The couple went to bed before Linda was awoken by a blood-soaked Brown yelling: “I’ve killed somebody.”

She had not been aware of Daryl having earlier got up.

Linda went on to make the grim discovery of her lover slumped against a door.

Brown claimed he had kicked Daryl in the head “to make sure he was dead”

The killer then escaped through a window he smashed.

Police and paramedics soon arrived. Brown hurled a knife at an ambulance at one stage.

But, he went on to boast: “I f*****g stabbed him. I am a murderer and I like it.”

Brown later said it was the “first time” he had met Daryl.

The court heard Brown appeared to become “fed up” as detectives quizzed him.

One officer put to him that “a young man was lying dead”.

Brown replied: “S**t happens.”

Daryl was found to have 10 wounds to his neck and chest. He also had injuries to his arm, hands, head and stomach.

The court was told Brown, of West Pilton, Edinburgh, had convictions for having offensive weapons.

He was also guilty of an assault a month before the murder.

His lawyer Gordon Martin told the court: “He deeply regrets his conduct.

“During the police interview, he said something like: ‘It was two lives wasted last night’.

“This is how he feels about matters.”

The court also heard claims Brown had the knives in Edinburgh as he was considering “self harm”.

Lord Matthews remanded him in custody as sentencing was deferred for reports.

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Scottish teen killer bragged: ‘I’m a murderer and I like it’