Sean Hoare, the first named News of the World journalist to speak out about phone hacking at the paper, was found dead on Monday.
He pointed the finger at Andy Coulson, who was editor while he worked there.
Hoare had said it was impossible Coulson did not know about the hacking, and in fact actively encouraged it.
“Everyone was doing it,” he said. “Everybody got a bit carried away with this power that they had. No one came close to catching us.”
He said hacking was “endemic” at the tabloid.
“People were scared. If you’ve got to get a story, you’ve got to get it, and you have to get that by whatever means. That is the culture at News International,” he said.
Police say Hoare’s death is “unexplained”. He was sacked by the paper before it closed and had recently become a recluse.