A man accused of running down his ex-girlfriend's former lover in a fit of rage later claimed that the victim ran in front of his car "like a f---ing stunt man", a Sydney court has heard.
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But the Crown prosecutor in the case said the defendant's explanation was physically impossible, as it would have required the victim to run "faster than Usain Bolt".
Kieran O'Connor, 35, is accused of murdering Andrew Sobolewsky, 33, on June 18, 2012, in the Blue Mountains, by crushing him under the wheels of his Mitsubishi Lancer.
He has pleaded not guilty.
In his opening address to Mr O'Connor's trial in the Supreme Court on Tuesday, prosecutor Mark Hobart, SC, said that the accused had been "incensed" on the day of the alleged murder after clashing violently with his former girlfriend, Lauren Hilton.
Ms Hilton had allegedly thrown a snow dome at Mr O'Connor when he returned to the home they had previously shared, with the accused allegedly responding by pushing her to the ground.
Despite this, the woman allegedly called Mr O'Connor back to the home only a few hours later, only to "kick him out again".
It was as Mr O'Connor was reversing out of the woman's driveway for a second time that Mr Sobolewsky, the woman's former lover, arrived.
It is the Crown case that, after a brief verbal altercation, Mr O'Connor deliberately drove over the other man, crushing his skull under the wheels of the car and then dragging him along the road.
Belinda Edens, a nurse who lived near the scene of the incident, said she looked under the car and saw a man with "his head crushed and full of blood".
"He took one giant breath and that was it," Ms Edens said, fighting back tears.
She said that as Ms Hilton walked past Mr O'Connor, he had screamed: "It's all your fault, you made me do this."
One of the first police to arrive at the scene, Constable Chris Webster, said Mr O'Connor had told him: "She threw a f---ing snow dome at my head."
The accused also allegedly said: "He threatened to kill me two weeks ago –he threatened to throw me off the balcony".
Mr O'Connor told police after the incident that he had been driving away from the home when Mr Sobolewsky ran towards his car, jumped onto the bonnet and then "tried to stop the car with his body like some kind of f---ing stunt man".
"I didn't mean to hit him," Mr O'Connor said in an electronically recorded interview.
"I slammed on the brakes but I couldn't stop in time."
However, Mr Hobart said there would be expert evidence disproving the accused's claim.
This included evidence that it would have been physically impossible for the man to catch up with and jump in front of Mr O'Connor's car.
"That would have been faster than Usain Bolt," Mr Hobart said.
The jury would also hear evidence, he said, that there was no damage on the bonnet of the car, disproving the claim that Mr Sobolewsky had climbed onto it.
The trial continues.
