The Crown of Thieves Adventure Path (specifically Part 3 - What Lies in Dust) contains rules for the orders of Hellknights, a series of LN/LE knightly orders based in Cheliax in Golarion, which venerate the orderly nature of Hell.
This includes a 15 level prestige class called the Hellknight, which a Fighter could qualify for after level 5, but otherwise might require some multiclassing (or extra feats spent on armour proficiency). The listed members of the orders come from a variety of classes, and don't always have levels in the prestige class.
I seem to remember one or more of the Paizo designers (no quotes available here) mentioning that someone wanting to play a LE holy warrior might reference the Hellknights, or the 3.5 Blackguard, as they specifically wanted the the Anti-Paladin to be CE.
If I were to do so, considering alternate Paladin archetypes, with some reference to Green Ronin's Holy Warrior (as Set noted) might be a good place to start. The Anti-Paladin itself is basically just an alternate Paladin archetype with a bigger writeup.
So to summarize that ramble, Paizo's Pathfinder material does not have any alternate alignment, Paladin-style holy warriors except for the Anti-Paladin.