McLeod will be sentenced next month.
Ms Wehi-Jack had just arrived home from work about 8.30pm and opened the door when the explosion ripped through her house. Badly burned, she managed to get outside the house where she was helped by neighbours who doused her with a garden hose. She was rushed to Northland Base Hospital in a serious condition but died surrounded by family less than 24 hours later.
Nearby resident Jill Russell, 79, said she heard "a huge bang from about a mile away".
She ran outside and saw flames shooting through the roof.
Mrs Russell saw Ms Wehi-Jack outside the house with burns to her face and her clothes torn, and went to her aid.
"It was terrible," Mrs Russell said.
At the time, specialist fire investigator Craig Bain said the explosion resulted from a faulty gas appliance in the kitchen area and called in an energy-safety inspector from Wellington and a gas-fire investigation specialist from Auckland to help examine the scene.