Oklahoma City bombing
In 2004, during Hammer's time on death row at USP-Terre Haute, he published his autobiography, The Final Escape. He wrote two books on the Oklahoma City bombing based on knowledge gleaned first-hand from Timothy McVeigh before McVeigh's execution: Secrets Worth Dying For: Timothy James McVeigh and the Oklahoma City Bombing (2004), co-authored with Jeffery William Paul.