This week he said although he sometimes thought about the incident that claimed Cameron's life, it was now "ancient history".
He believed "there were problems" in the neighbourhood at the time of the stabbing and despite his family calling for help they never got it from the authorities.
Emery said before he went to prison he wanted to send a letter to Cameron's mother to "make amends". But all family members had only approached him with anger.
"[If] I'd never heard him, [if] I didn't see him I wouldn't have woken up and seen the graffiti," Emery said.
"I would have just been a little more frustrated. But I can't take all the responsibility - he could've easily put up his hands and said 'You caught me'."
Emery was released from prison in late 2010, having served less than two years' prison time.
Emery, his wife and their three daughters have since moved from Manurewa for a fresh start.