Hoare gave an interview to the New York Times in 2010 that bolstered allegations the phone hacking was a widespread and accepted practice at the tabloid. He also said that Coulson encouraged the practice. Hoare was let go from the News of the World for problems related to drinking and drugs.
Hoare had been in contact with the Guardian and the New York Times only last week, stating that the News of the World staff used police technology to track phones.
Here is the 2010 BBC interview with Hoare speaking about the phone hacking.