John Bisset/Stuff Nathan Joseph Groom, of Timaru, has been sentenced to home detention after an assault on a police officer. (File) A Timaru man whose assault on a police officer split their head open and left them requiring stitches, has been sentenced. Nathan Joseph Groom, 34, was sentenced to six months’ home detention when he appeared before Judge Joanna Maze at the Timaru District Court on Friday. He earlier pleaded guilty to one charge of injuring with intent to injure and one charge of resisting police. Lawyer John Black said the offending was “totally out of character” and a “moment of madness in a highly volatile and difficult situation”.