- "I was working on Afghanistan intelligence, which... Maybe you know it's just an oxymoron because our basic tactic is to pay anyone we can to tell tales. You know? "Hey, kid. Tell me a story, I'll give you some money." So they did, you know? And my job was to, uh assess this shit pile for actionable intelligence. It was a monumental waste of my time. 'Till one day, they sent me something interesting."
- ―Micro to Frank Castle[src]
In addition, Lieberman was leaking classified information of the government and corrupt officials, gaining the attention of the New York Bulletin who wanted to write an article on him. Rawlins ordered Carson Wolf to personally meet with Mitchell Ellison and convince him not to write the article so it wouldn't "compromise" Homeland Security investigation. Afterward, Rawlins ordered Wolf to hunt down and assassinate Lieberman before their illegal activities were revealed to the public.
In New York City, David Lieberman was chased by Carson Wolf and Homeland Security agents until he stopped at a pier. Wolf ordered Lieberman to get on the ground, with the latter telling him he was no criminal and was a NSA analyst. Wolf shot Lieberman in the chest, presumably killing him and stopping him from revealing William Rawlins' illegal operations.
Once Castle returned to his old ways after saving one of his co-workers from the Gnucci Crime Family, Lieberman secretly watched the Massacre at Linello's. The two would later join forces to stop the corrupt officials in the government, leading the attack and death of Carson Wolf.