Martin Harris doesn't exist. He was a false identity assumed by Martin (whose real name is William). William is an assassin hired to kill Bressler and steal his research on a new resilient crop that is worth billions. Liz was his accomplice and the fake Martin was a backup in case William failed to pull through. William goes to the hotel and alerts security, causing everyone to flee the building. The bomb William planted in the hotel explodes, killing Liz. William kills Fake Martin and he and Gina change their identities and leave the country.