Thavisha Lakindu Peiris, 25, was found slumped at the wheel of his car on Sunday evening in the Southey area of Sheffield.
His manager at the nearby branch of Domino's Pizza, Ravi Marripudi, said Mr Peiris had not been feeling well that evening but had agreed to make one last delivery before going home.
Mr Marripudi said he set off to take the pizza to Southey Crescent - about a mile from his base - at about 9.50pm.
But 15 minutes later he got a call from the customer saying the order had not been delivered and there were voices outside.
The manager said he sent another driver to look for Mr Peiris and he found his colleague unconscious in his Toyota Yaris, in a residents' parking bay near the delivery address.
"It is so shocking," Mr Marripudi said.
"He was such a kind person.
"If someone had wanted money, he would not have fought. He would have handed it over.
"He was just a really nice person."
Mr Marripudi said the incident had worried delivery drivers and four had decided to quit.
Mr Peiris came to the UK from Sri Lanka to study IT at Sheffield Hallam University.
He had started working at Domino's to help fund his studies.