He was found slumped at the wheel of his car on Sunday evening in Southey area of Sheffield. At the time, he was on his way to deliver a takeaway.
Detectives said they could not explain the brutal and shocking death of a career-minded and hard-working young man.
According to South Yorkshire police, Peiris was making his last delivery for Domino’s Pizza when he died. He had been working for the chain as he studied IT at Sheffield Hallam University.
Officers said he was delivering an order to an address in Southey Crescent that was due at about 10pm. When he failed to deliver the order, his workmates set off to find him.
Peiris was born in Sri Lanka and had successfully applied for a job as an IT consultant.
An autopsy showed he died of stab wounds. A 50-strong police team is working on the murder inquiry. Detective Superintendent Lisa Ray, leading the investigation, said no motive had been established for the murder. Peiris’ family is preparing to travel to South Yorkshire, police said.