Jamie Collins (pictured) was ambushed and killed after returning home from university

A student has been jailed for life with a minimum term of 28 years for murdering his university housemate after lying in wait and stabbing him 30 times.

Zack Coughlan, 23, dressed in black and wore a mask to ambush Jamie Collins, 21, in the garden of their home near Bristol on 8 April.

Coughlan left his victim dying in an alleyway as he cycled away to dispose of bloodstained evidence. He called police eight hours later.

Coughlan had denied murder and a trial was under way at Bristol Crown Court but he changed his plea to guilty on Tuesday.

Coughlan initially tried to blame masked attackers for his housemate's murder

Both men were final-year University of the West of England students.

During sentencing, Judge Justice Linden told Coughlan: "Collins was an idealist who took an interest in the problems of the world and society.

"It comes with great shock that anyone could do what you chose to do to him.

"I'm sure you were planning to kill Collins and had been for some time.

"Your guilty plea came at a point in the trial when your conviction was inevitable."

During the trial, Coughlan claimed he was fearful of Collins, saying he had threatened to kill him and therefore he had "no choice" but to wait for his housemate to return from university and stab him repeatedly.

Judge Linden said: "I do not accept your evidence that he did or said anything that made you believe he would be violent towards you in any way.

"Your evidence about these conversations was at odds with other evidence about Collins, that he was a gentle soul who was averse to conflict and confrontation."

After the attack, Coughlan left his housemate to die in the alleyway behind the house they shared before cycling away on the victim's bike.

On returning home, Coughlan ate pizza and played video games, claiming he "had to disconnect" from what happened. He did not call 999 for another five hours.

The entire attack was caught on CCTV, which jurors heard Coughlan later rewatched five times.

Killer's 999 call claiming housemate's body found cold

Collins only had two pieces of coursework to complete before he would have returned home to his family in Swansea, where his dad already had an engineering job set up for him.

Lisa Jane Collins, Collins' step mother, wrote a statement that was read out in court.

"It has affected our family in a deep, lasting and profound way," Lisa said.

"From now on, we will always be the couple whose boy got murdered."

Lisa added that Collins' father Rob was incapable of working due to the stress and his business went under, leaving him in debt.

"Listening to the over performative drama of Zack's evidence was excruciating as he made himself out to be the victim," Lisa added.

Det Ch Insp Lucy Edgeworth, of the major crime investigation team, said "all the evidence suggests" the killing was a "pre-planned, cold-blooded execution".

She said despite Coughlan claiming his housemate's political views had become more extreme and that he had talked about killing Coughlan, the motive for the murder was "not clear".

"We know there was a dispute about rent. We know that they held different political views. But none of those things make any sense to why somebody would carry out such a horrific crime," she said.

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Student stabbed housemate 30 times in masked ambush