No name, no photo, no notoriety.
Tom Teves' son Alex was one of the 12 people killed in what became known as the Batman Shootings in Colorado in 2012.
He founded No Notoriety - a group dedicated to stopping anti-heroes being created in the media following deadly attacks.
Teves told Mike Hosking publicising attackers becomes a motivating factor for others.
He said most of them aren't publicly known beforehand.
"When they spill a little blood the whole world knows who they are. A man who was known by no one is now known by everyone."
"It becomes a motivating factor for the people who might have the same motivation, probably sitting in their mum's basement, to go out and sneak up behind people and shoot them so that they can be as popularised as the ones in the past have."
He said a lot of shootings in the US have been motivated by previous shootings.
Meanwhile, the accused gunman of the Christchurch terror attack is being denied access to newspapers, television and radio while being held in segregation.
Denying him access to media outlets would prevent him accessing media reports about the massacre committed on Friday afternoon.
In a statement to the Herald, Corrections said the 28-year-old accused was being held under 24-hour surveillance and no visitors have been approved to see him while he was in segregation.