US - He refused to buy his 19-year-old son a pack of cigarettes. So the son took off in his father's lorry to buy them.
Mr James Comstock called US police saying that his lorry, belonging to a lawn care company, was stolen.
The police pursued the son to the heart of Iowa State University Campus. During the chase, he rammed the car of police officer Adam McPherson. The lorry eventually stopped, but Mr Tyler Comstock revved the engine and refused orders to turn it off.
Mr McPherson fired six shots into the lorry. The son died from two gunshot wounds, according to the Iowa state medical examiner's office.
Mr Comstock said his son was unarmed.
"He took off with my truck. I call the police, and they killed him," Mr Comstock told The Des Moines Register on Tuesday. "It was over a pack of cigarettes. I wouldn't buy him any. And I lost my son for that."
During the chase, an unidentified police officer twice suggested that police back off their pursuit, according to dispatch audio obtained by the newspaper.
Mr Tyler Comstock's step-grandfather, Mr Gary Shepley, 65, said he keeps asking why police pursued an easily identifiable green-and-white lorry into a busy part of campus. The family said police could have backed off and found the vehicle later.
Said Mr Shepley: "They're trained to handle these situations. And if they panic before they even know what's going on, then ask yourself: What if it was your child?"
The Comstock family said the son had made mistakes but he was getting his life back on track.
He had recently broken up with his girlfriend and had spent several days in jail because of a disorderly conduct charge, the family said.
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