The film takes place in four acts, and each act reminded me of a Twilight Zone episode. Each of the acts delivered.
Our revenge-seeker is after the four men who killed his brother, and he exacts his revenge in four unique ways. His targets are a rancher, a gangster preist, a gambler, and an over-the-top albino with an obsession for gold and blonds.

The German release of "Death Sentence" is called, "Django: Merciless as the Sun"

Check out my list: https://trakt.tv/users/jeffsmith99/lists/spaghetti-westerns-i-want-to-watch

I did not find this on Amazon Prime, and did not find it anywhere dubbed in English.

There are a couple versions with autogenerated subtitles on YouTube
Spanish: https://youtu.be/DGOaI5eDGWc "Sentencia de muerte | PELÍCULA DEL OESTE | Acción | Peliculas completas en español"
Italian: https://youtu.be/SnZwgLx0Hlc "☀ Sentenza di Morte ☀ Film Completo ▸ Tomás Milián 1968 ▦ by :skull_crossbones:Hollywood Cinex™"