A 9.51am on September 1 2014 a balaclava-clad man stormed into the Work and Income New Zealand office in Ashburton and opened fire.

In just 61 seconds he gunned down and killed two women and almost murdered two more.

Then he calmly walked back out of the office, unlocked his bike and peddled away into the distance - leaving bloody carnage and chaos in his wake.

The man was Russell John Tully and his horrendous, deliberate and planned actions that day shook New Zealand.