An Auckland man's relationship with an ex-business partner soured so severely that he drove to the man's home "with murder on his mind", a court has heard.
Martin Victor Lyttelton, 57, is on trial before the High Court at Auckland charged with the attempted murder of Richard Ord and causing grievous bodily harm to Mr Ord's partner, Colleen Fenton, with intent to injure her.
He has also denied a charge of aggravated burglary of the couple's North Shore house.
Crown prosecutor Scott McColgan said Lyttelton turned up at the property with a loaded .410 shotgun, spare shells and a skinning knife.
He allegedly moved through the rooms of the house, seeking Mr Ord, before he came to a locked door.
Lyttelton aimed a shot which passed through the door and struck Ms Fenton in the leg, grievously wounding her.