Auckland police have arrested a 29-year-old Mangere man and charged him with the murder of two year-old James Joseph 'JJ' Ruhe Lawrence.
The accused, a former Orakei resident, will appear in Auckland District Court tomorrow.
JJ died on November 14 at the Orakei house where he lived with his mother and her boyfriend.
Police said he died from injuries suffered as the result of blunt-force trauma to his abdomen.
He was struck so hard in the stomach that one of his major internal organs split in half.
Emergency services were called at about 11.15am, but JJ was already dead when they got there - despite the CPR efforts of several adults at the house - and a homicide investigation was launched.