In Live Free or Die Hard (2007), what is the name of the hacker who helps John McClane?

In Live Free or Die Hard, the hacker who helps John McClane is Matthew Farrell.

Matthew Farrell is played by Justin Long. McClane, played by Bruce Willis, encounters him after Farrell is targeted by cyberterrorist Thomas Gabriel. Farrell has written code connected to Gabriel’s scheme and becomes an unwilling guide to the digital side of the crisis. The pairing contrasts McClane’s hands-on police experience with Farrell’s technical knowledge.

Farrell is sometimes confused with Warlock, another computer expert in the Die Hard series. Warlock is a separate character who appears in the film and assists the protagonists remotely. Thomas Gabriel is also not the hacker ally: he is the main antagonist and the architect of the attack.

The film’s “fire sale” plot imagines a coordinated assault on transportation, finance, utilities, and communications. Its cyberwarfare is highly cinematic, but Matthew Farrell’s role is clearly that of the reluctant hacker recruited into McClane’s physical fight.