WESTPORT — A man originally thought to be an innocent bystander to a fight that broke out in the middle of morning traffic on the Post Road has been arrested for his role in the October brawl.

Jose Alvarado, 41, of Bridgeport, originally claimed to be a helpful bystander in the incident, but was later determined by detectives to have partaken in the assault and was known to one of the fighters, Fernando Morales, of Derby.

An arrest warrant was granted for Alvarado and on Feb. 2, he was detained by State Police Troop G and transported to Westport police headquarters, where he was charged with second-degree assault and released after posting $25,000 bond.

A video of the assault, which was released by police in October, shows Rafael Valle, of Bridgeport, exit a white van that proceeded to drive down the wrong side of the road, in the wrong direction. Morales is seen chasing after Valle, who falls to the ground prior to the assault.

The fight, according to witness footage, took place in the middle of the road and was said to have originated in Derby.

The video shows Valle being dragged by his feet before Morales begins to hit and kick him, even stomping on his head several times. An additional vehicle pulls up to the scene and another male, later identified as Alvarado, exits the vehicle and begins to kick the victim, who was on the ground, in the head.

Alvarado is scheduled to appear in state Superior Court in Norwalk on Feb. 13. Morales was previously arrested and charged with second-degree assault, first-degree reckless endangerment, and breach of peace. Valle was arrested previously on charges of first-degree reckless endangerment.