A murder trial at Bristol Crown Court hears that student Zack Coughlan, 23, stabbed his housemate, Jamie Collins, 21, 30 times after allegedly lying in wait for him to return home. Prosecutors say Coughlan dressed in black and wore a mask and gloves, ambushing Collins in the garden area of their property near the University of the West of England.

The accounts also describe Collins being left with fatal injuries after the attack, with Coughlan cycling away as he died. Several outlets report that the dispute leading up to the killing involved disagreements over rent. The trial details both the lead-up between the two students and the circumstances of the ambush, including the victim’s study background in robotics.