Mr Evans died with the MRSA superbug after contracting pneumonia. The illness followed a ruptured lung, first diagnosed after he was transported from Mt Eden prison to Nga Wha prison in Northland.
Labour MP Kelvin Davis told Parliament yesterday he had been told an assault was behind Mr Evans suffering a ruptured lung.
Mr Davis told Newstalk ZB this morning he was "sick and tired of people getting there lights punched out and thrown off balconies".
He would not reveal his source but confirmed he was "an upstanding member of the community".
Mr Davis told Newstalk ZB he was unsure why it was reported that Mr Evans died from a super bug, but said it was not in the prison's best interest to go "down the ruptured lung line".
"It's not in their best interest to go down the ruptured lung line... the other thing is maybe that was the result of a ruptured lung, he got an infection and the super bug killed him in the end.
"Maybe they are right but what was the cause of the super bug in the first place?"
He said it would be interesting to see what an autopsy would reveal.
"I look forward to reading that. This isn't the only incident and there are other prisoners as well. There was a report in the news in February about a guy who was thrown off a balcony, who was then beaten up on the ground, and one prison officer dragged him to safety.
"You just need to look at the videos that have popped up on YouTube. The prisoners are in control of the prison, it's just a mess."
Mr Davis told Newstalk a "full blown investigation" needed to take place.
"On day these 'thugs' are going to get out on the street, they'll of honed their skills on how to beat people up and one day you and I might walk into them.
"I would prefer they were shown how to be non-violent in prison other than given conditions where they can hone those skills."
"He was sorting his life out"
A former inmate who served time with Mr Evans told the Herald his long-time friend had resolved to turn his back on methamphetamine and the lifestyle which landed him behind bars.
"When I saw him last, he was right in the head. He was in the right frame of mind. He knew it was time to grow up. He was going to get a job when he got out. It was the little fright he needed. He was sorting his life out. He was one of the few who was going to make it.
"He didn't deserve to be in jail. He should have been in rehabilitation."
The friend, who had known Mr Evans for years, said his friend was gifted with the ability to draw laughter from those around him.
"I've never met such a loving and intelligent boy in my life. He was so brainy, so bright. It's such a waste of a life."
Another friend who grew close to Mr Evans when he was a teenager said he was ready to leave the drug behind. "He wanted to be clean. He wanted to live a normal life.
"Nick was at a point where he wanted to start a new life. It was taken away from him."
She said Mr Evans shouldn't be judged for his addiction which was enjoyed at the time by many teenagers from central and East Auckland.
She said he had come from a solid family which loved and cared for him - a love which he returned.
"For our generation, it wasn't the drug but the lifestyle that went with it. The majority were middle class, upper class kids with money to throw around. It was that Remuera crowd. The town was filled with (methamphetamine).
"It was living life through a music video. It was all about having fun.
