In the appeal Crown prosecutor Zannah Johnston highlighted Haerewa's previous record, including violence against James Whakaruru three years before the fatal attack, concerns at the time of his release, a breach of release conditions a month later, and the subsequent offending which included repeated beatings and threats.
His partner regularly bore the bruising and other signs of Haerewa's attacks,which came amid other violence and threats marked by smashing holes in the walls with a tomahawk, and carving out the word "child killer".
Once he plunged the weapon into a bed beside his partner as she lay in bed, and once after telling her she would lose a leg he beat her so much with a broomstick that she was unable to walk for two days.
He once punched the woman in the face while they were driving, because he disapproved of her talking with her child's basketball coach, and a child's birthday party was disrupted when Haerewa hurled a can of drink at the boy's head.
The prosecutor told the Appeal court that while the Hawke's Bay killing was more than 20 years ago it was part of the fear created in the latest incidents.
Court of Appeal panellist Justice Ailsa Duffy wondered what Haerewa might have done to the woman if she had been provoking him, rather than trying to appease him, and said he could "explode" if he didn't get what he wanted.
But Haerewa's lawyer, Warren Pyke, argued Haerewa could "make progress" while in prison sufficient to be safely released at the end of the term.