Prison is meant to contain the world’s most dangerous criminals – but for these 20 inmates, it became their final battlefield. From Jeffrey Dahmer to Whitey Bulger, Richard Huckle and more, discover the shocking stories of notorious killers and mob bosses who met violent ends behind bars. Revenge, gang wars, and prison justice collide in this true crime countdown. 00:00 Intro – 20 criminals who died behind bars 00:15 Jeffrey Dahmer – The Milwaukee Cannibal 00:40 Jesse Anderson – Double Execution 01:01 Whitey Bulger – Mob Boss Betrayal 01:25 Carl Williams – Melbourne Gangland Wars 01:47 Richard Huckle – Britain’s Worst Pedophile 02:06 Roger Kibbe – The I-5 Strangler 02:24 Gerard John Schaefer – Killer Cop 02:44 Lloyd Avery II – Hollywood Tragedy 03:04 Felix Mitchell – Oakland Drug Lord 03:25 Rodolfo Cadena – Mexican Mafia War 03:50 Yvan Colonna – Corsican Nationalist 04:09 Thor Nis Christiansen – Hitchhiker Slayer 04:27 Leslie Bailey – UK’s Most Vengeful Prison Murder 04:43 John Geoghan – Priest Behind Bars 05:03 José Antonio Rodríguez Vega – The Old Lady Killer 05:24 Charles Schmid – Pied Piper of Tucson 05:43 Donald Leroy Evans – Death Row Murder 05:58 Colin Hatch – Cleansing the Prison 06:19 Enriqueta Martí – The Vampire of Barcelona 06:35 Albert DeSalvo – The Boston Strangler 16:20 Outro – Prison Justice