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The Prison Warden (center)

No one has ever, ever escaped from here. I'd sooner jump in the boiling lake myself than let that record fall. Don't forget it.
~ The warden.
The Prison Warden is known as the man in charge of the Fire Nation prison the Boiling Rock. He appears in the Avatar: The Last Airbender episodes the boiling rock part 1 and 2. He is known as the uncle of Mai as well who is Zuko's love interest. He is a cruel warden who frankly does not take crap from any of his prisoners as shown with Hakoda of the Water Tribe who is Sokka and Katara's father. He did not get killed he was disposed of by Team Avatar and locked away.

It seems likely that, with Zuko and Sokka's group being his first real escapees, added to Mai's attack on Azula, he wasn't warden for very much longer. Despite this, it is later mentioned that he pulled some strings to get Mai out of prison, showing he had at least some form of respect from his superiors.

           Avatar: The Last Airbender Villains

Fire Nation
Fire Lord Ozai | Fire Lord Azulon | Sozin | Zuko | Azula | Ty Lee | Mai | Zhao | Ukano | Combustion Man | Yon Rha | Prison Warden | Warden | Bujing | Mung | Engineers

Earth Kingdom
Hou-Ting | Jet | Chin the Conqueror | General Fong | Xin Fu | Gow | Long Feng | Dai Li Sergeant

Water Tribe
Hama | Tahno | Tarrlok | Noatak | Yakone | Varrick | Zhu Li | Unalaq | Eska | Judge Hotah | Gilak | Thod | Thod's disciples

Amon | Lieutenant | Hiroshi Sato

Red Lotus
Zaheer | Ghazan | Ming-Hua | P'Li | Aiwei

Earth Empire
Kuvira | Baatar Jr.

Vaatu | Dark Spirits | Wan Shi Tong | Koh | Kemurikage | Hundun | Old Iron

Other Groups
Dai Li | Rough Rhinos | Southern Raiders | Yuyan Archers | New Ozai Society | Triple Threat Triad | Royal Procession | Bison Rustlers

June | Lightning Bolt Zolt | Shady Shin | Tokuga | Wonyong Keum