A knife-obsessed killer's remorse for his actions was like that of Shakespeare's Lady Macbeth, according to his defence lawyer.
Theodore Derrick-Hardie was yesterday sentenced to life imprisonment with a minimum non-parole period of 11 years for murdering 18-year-old Warren Rosillo at a birthday party last year.
Derrick-Hardie's jealousy over his ex-girlfriend's friendship with Rosillo spurred him into a rage which ended the young Filipino man's life.
Derrick-Hardie grabbed him around the neck, whipped a knife out of his pocket and stabbed Rosillo in the head, chest and abdomen.
He admitted the killing last month.
At his sentencing in the High Court at Auckland yesterday Derrick-Hardie's lawyer Alan Cooke said he had found himself reading Act Five, Scene One, of Macbeth.
''The passage concludes with what I think sums up my client's remorse and horror - 'here's the smell of blood still. All the perfumes of Arabia will not sweeten this little hand'.''
He appealed for a ''merciful sentence'' so as not to crush the teenager.
''He doesn't have the ability to express himself.
''His immaturity and what he's done have been absorbed and struck him dumb.''
Derrick-Hardie's guilty plea on the first day of trial spared Rosillo's family from what would have been a ''harrowing'' process, Justice Edwin Wylie said.
But it also came ''late in the day'', he said.
Text messages sent by Derrick-Hardie to friends following the killing indicated pride in what he had done.
A photo of him pulling a one-fingered gesture to media outside court also ''flew in the face'' of his assertions of remorse, Justice Wylie said.
He urged Derrick-Hardie to seek help for conflict resolution, and with dealing with rejection and violence. ''There's a lot you need to learn.
''I'm confident you can be rehabilitated and reward the faith that your family has shown you.''
The killing was described as ''callous'' by Crown prosecutor Shaun Cathcart, and Justice Wylie agreed.
Derrick-Hardie had been obsessed with knives in the months before he murdered Rosillo, the court heard, while Facebook entries in the months leading up to the killing showed there was a degree of pre-meditation.
''You distinguished yourself as a dangerous and menacing member of society,'' Justice Wylie said.
Friends of Rosillo's from Edgewater College, who were with him on the night he died, said they doubted Derrick-Hardie would change.
''He won't even be 30 by the time he gets out,'' one friend said.
The court heard how Theodore Derrick-Hardie's fascination with knives had grown in the months before the murder.
Derrick-Hardie had threatened to slice his ex-girlfriend's throat, and he and his girlfriend went to meet her and her new boyfriend.
Derrick-Hardie armed himself with a machete and gave the girlfriend a pocket knife, but the meeting never happened.
On July 21, 2011, Derrick-Hardie bought a 19cm Lebendwell folding knife from King of Knives.
His girlfriend broke up with him the next day after she found photos of his ex-girlfriend on his computer.
During a fight, he said the break-up was all his ex's fault, and he would ''find her and slice her throat''.
On July 29, Derrick-Hardie went to a friend's birthday party in Pakuranga.
Rosillo, who did not know Derrick-Hardie, was also there, as was Derrick-Hardie's now ex-girlfriend.
About 10.30pm, Rosillo and the girl were flirting and talking. Derrick-Hardie asked her to go outside with him and they began fighting.
Rosillo tried to defuse the situation, but when Derrick-Hardie accused the girl of being unfaithful to him she got angry and kissed Rosillo.
Derrick-Hardie then grabbed Rosillo, stabbing him several times.
Rosillo staggered onto the road while his friends unsuccessfully tried to save his life.
Derrick-Hardie fled the scene and was found at a room at the Heritage Hotel the following night.
- Auckland Now