The police had reviewed the file and initially decided to go ahead with the prosecution, and O'Rourke - a former lawyer - said he was also getting his own expert report on the March 6, 2021, crash at Governors Bay near Christchurch.
Today, the police sought the judge's leave to withdraw the charges because they did not believe there was a reasonable prospect of conviction. There was insufficient evidence to justify a trial.
"Of course, I agree with that, Sir," O'Rourke told Judge Rollo.
The crash happened when the wedding car he was driving and a motorcycle collided as he drove a bridal party into the grounds of St Cuthbert's Church in Governors Bay, killing the rider, Josh Broughan.
Broughan - known by friends as Joe - died at the scene. He was remembered by friends as being "hilarious" and with an "outgoing personality that everyone loved".
O'Rourke had a lengthy career in local politics, serving as a city councillor in Christchurch for 15 years from 1989 until 2004. He was an MP for NZ First from 2011 to 2017.