Zack Coughlan, 23, has pleaded guilty to the murder of Jamie Collins, 21, after stabbing him 30 times in what prosecutors described as a "carefully planned and cold-blooded execution."
Coughlan, dressed all in black and wearing a mask and gloves, ambushed Mr Collins in the garden of their home in Filton, South Gloucestershire, on April 8. Mr Collins, a student at the University of the West of England (UWE Bristol), was studying robotics alongside his killer.
Attack and Aftermath
Bristol Crown Court heard that Mr Collins was stabbed repeatedly shortly before 6pm after cycling home from UWE Bristol. Coughlan left him dying in an alleyway and cycled away on his housemate's bike.
Coughlan dumped the bike at a nearby retail park, bought a change of clothes, and threw his bloodstained clothing in a pond in carrier bags weighed down with bricks. He returned to the house they shared in Cleve Road at about 9pm, put a pizza in the oven, and did some online gaming with friends.
Legal Proceedings
Coughlan had denied murder but changed his plea to guilty after a legal ruling by the trial judge on Tuesday. Mr Justice Linden ruled that Coughlan's partial defence of manslaughter by reason of loss of control could not be left to the jury to consider.
The judge told the jury: "You will have just heard that the defendant has changed his plea to the indictment to guilty. That means that he now admits the charge of murder." He added: "I would like, on behalf of us all, to thank you for the service that you have given in this case."
Investigation and Family Response
The attack was caught on CCTV installed at the house they shared, which Coughlan showed to attending police officers who initially treated him as a witness. The defendant's blood was found on Mr Collins' bike, and analysis of his mobile phone matched the killer's movements afterwards captured on CCTV. He also had injuries to his hands and told people who saw him bleeding that he had been climbing trees and had fallen and hurt himself.
Coughlan, of Cleve Road, Filton, is half Danish and grew up with his family in Cork, Ireland, before moving to Bristol to study robotics at the age of 19. He and Mr Collins, originally from Swansea, were both final year students and lived together in a £300,000 three-bedroomed house owned by the defendant.
In a statement released after Mr Collins' death, his family said: "Our Jamie was a bright, kind, gentle and unassuming young man with his whole life ahead of him. He was looking forward to finishing his uni journey and planning to come home to us in Swansea in just a few weeks' time. We know he was heading for a hugely successful future following his engineering and robotics degree."
Coughlan will be sentenced on Wednesday morning.
