Shadrock, 25, hit Jian 'Joanne' Wang in a stolen 4WD in the carpark of the Manukau Westfield shopping centre in June 2008 after snatching her handbag.
She died of head injuries in hospital the next day.
Shadrock's four co-accused were also found guilty of being accessories after the fact for their part in covering up his tracks afterwards.
The jury returned its verdict this afternoon after retiring to deliberate on Tuesday afternoon.
In his summing up on Tuesday, Justice Timothy Brewer apologised to the jury for the length of time the trial had taken - what was initially meant to be a three-week trial has taken nearly six.
He told the jury to focus on Ms Wang's movements prior to being hit, where she was hit, the speed Shadrock was travelling prior to hitting her and whether he used just the stolen 4WD's gears or also braked when changing from reverse to drive forward.
These were crucial points to the case, strongly contested by the defence and prosecution.
"The onus is on the Crown to prove the charge it brought before the court.''
Justice Brewer reminded the jury that they had to believe ``beyond reasonable doubt'' that Shadrock was conscious that there was a real risk Ms Wang could die, or by hitting her with the 4WD he could cause her injuries that would result in death.
Crown prosecutor Kevin Glubb earlier told the jury it was a bag-snatching that just went so horribly wrong.
"She didn't stand a chance.''
In her handbag was a large amount of cash from a small business she owned, he said.
Shadrock's lawyer Chris Wilkinson-Smith told the jury in his summing up that on the morning of the bag-snatching, Shadrock had been drinking and he was "tipsy''.
He said that although Shadrock went to the carpark that day with the intention of carrying out the ``grubby work'' of robbing someone it was never his intention to murder anyone.
"In my heart I know I didn't mean to hurt her,'' he said Shadrock told police during an interview.
Mr Wilkinson-Smith said Shadrock didn't hit Ms Wang head-on, and "he wasn't really aware of where she was'' in relation to the vehicle.
Mr Glubb had told the jurors in his opening address that Shadrock had options as he left the Manukau carpark, and the killing was unnecessary.
He said Shadrock ran down Mrs Wang in his desperate attempt to get away.
Mr Wilkinson-Smith earlier told the jury that he suspected they felt nothing but loathing for his client.
"So 'thief',' bag snatcher' and 'coward' are all labels he must wear with shame ... but with that, the Crown is asking you to add the label of 'murderer'.''
He said his client did not intend to hurt anyone when he drove off with Mrs Wang's handbag.
"The possibility that Mrs Wang could die never entered his mind.''
In the days after the incident, Shadrock's friends tried to help him by hiding the handbag and burning the stolen car they knew had been used to allegedly kill Mrs Wang and would tie him to the crime.
Maka Tuikolovatu denied hiding Mrs Wang's handbag at his home.
Three others - Vila Lemanu, Lionel Tekanawa and Terence Tere - have denied destroying evidence, namely setting fire to the Nissan 4WD in the days following Mrs Wang's death.
