Thavisha Lakindu Peiris, 25, was killed while making his final pizza delivery before starting a new career as an IT consultant.
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.
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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. She said: "Everything we have learned from his family, friends and workmates at Domino's suggests he was a career-minded, hard-working, bright, articulate and friendly young man who was very much planning his future.
Peiris' family is preparing to travel to South Yorkshire, police said.
A number of people were arrested and questioned by detectives but they have been released without charge, a police spokesman said.