A university student who allegedly stabbed his housemate 30 times to death appeared 'incredibly shocked' when police later attended the scene, a court heard.
Jamie Collins, 21, was ambushed by his housemate Zack Coughlan, 23, in the garden of their home shortly before 6pm, Bristol Crown Court previously heard.
The pair were said to have rowed over the amount of rent Coughlan was charging Mr Collins.
Mr Collins, originally from Swansea, was allegedly stabbed repeatedly – with Coughlan leaving him to die in the alleyway as he cycled away on his housemate's bicycle, dressed in black and wearing a mask on April 8 this year.
Coughlan, of Cleve Road, Filton, is said to accept that he killed Mr Collins, but he denies murder.
The court heard how Coughlan purchased the home on Cleve Road, Filton, and lived in it with Mr Collins and fellow student Charlie Latimer.
On Wednesday, a video of a police interview Mr Latimer gave on the evening of April 9 was played to the court.
Mr Latimer described returning home from the supermarket at about 7pm the previous day and later noticing that the gate at the end of the garden was open.
Jamie Collins (pictured) was allegedly stabbed to death in the garden of the university home where he lived with Zack Coughlan, 23, who is now on trial accused of his murder
Mr Collins (pictured) was said to have been stabbed repeatedly with Coughlan leaving him to die in the alleyway as he cycled away on his housemate's bicycle, dressed in black and wearing a mask, Bristol Crown Court was told
He went to bed but awoke at about 1am and was unable to get back to sleep, then heard a noise from Coughlan at about 2am.
Then he heard 'quite loud banging' on the door, which he assumed was Coughlan trying to wake him up.
'I got to the kitchen,' Mr Latimer said. 'I opened the back door and I could see some people in the back. This was the police.
'I could see that there was a body on the floor and around three or four people around them. They told me to stand back.'
Mr Latimer said the police initially asked him about 'James' but this had not registered in his brain as Mr Collins, who was known as 'Jam' to his friends.
Police officers escorted Mr Latimer and Coughlan out of the property and to the bus stop outside, where they were then put into separate police cars.
In the interview, Mr Latimer described looking at Coughlan and said: 'I could see he was incredibly shocked.'
Mr Latimer told how the three friends were studying the same robotics course and spent time together shopping, cooking for each other, and having board game and movie nights as well as playing video games.
He said Mr Collins was 'very Left-wing but not really the type to argue with someone over that'.
In October or November last year, Mr Collins and Coughlan had a 'slight' disagreement over rent, Mr Latimer said.
'Jam thought we were paying too much,' he told police.
'Zack is very mature. He likes to keep things very civil. If there's a problem, he likes to talk about it. He decided we just wouldn't have to pay rent living there.
'Zack had realised Jam was being a bit, not hostile, but he was standoffish. He didn't want to hang out with Zack.
'Zack realised and had a conversation. Jam told him he thought it was a bit of an insult that we had to pay so much as friends, to live in a friend's house.'
Footage of the 'carefully planned and cold-blooded execution' was captured in Filton, South Gloucestershire, on April 8 this year
Bodyworn camera footage of the police arriving on the scene of the murder shows Coughlan after he called police in the early hours of the morning
Mr Latimer said they had been paying £650 per month but this was reduced to £500, then they only contributed to the household bills.
He described Coughlan as an 'extroverted' person, with 'lots of confidence', who liked to organise movie nights and ran a Dungeons & Dragons – a fantasy game – campaign.
During cross-examination by Dan Pawson-Pounds KC, representing Coughlan, Mr Latimer said that Mr Collins could 'possibly' be described as having communist views.
He agreed that Mr Collins criticised large multi-national corporations and individuals with high levels of wealth, as well as landlords.
Mr Latimer said Mr Collins was planning to move out of the house and return to Wales when his studies had finished.
On Tuesday, jurors watched CCTV footage of the fatal incident – captured on a motion-activated camera installed at the house – and of Coughlan disposing of blood-stained clothing afterwards.
Dawn Comley, a cleaner at SGS College, told police she encountered Coughlan at the site on the evening of April 8.
'I was suspicious of him,' she said.
Ms Comley described how Coughlan was carrying a bag, which had a 'jumper stuffed on the top', and she wondered if he had been stealing.
She said she had questioned Coughlan as he appeared to be bleeding and he claimed he had cut himself climbing trees.
'It just didn't make sense,' Ms Comley said.
'I thought: why would he be climbing trees up here?'
The court previously heard how police recovered clothing from a pond, which had been worn by Coughlan during the fatal attack.
Coughlan, of Cleve Road, Filton, South Gloucestershire, denies murder.
The trial continues.