Caesar Ramón Martínez (Comic Series)

Caesar Martinez (usually accost with his last name, and couple times with the name "Rodriguez" ) was a fence guard and the man who helped Rick, Glenn, Michonne, Doctor Stevens and Alice escape from Woodbury, Georgia; only to betray them later.

Pre-Apocalypse
Caesar Martinez was a man who was formerly a gym teacher before the outbreak. He never married or had kids, and he was not on speaking terms with his parents either. His school had been designated as a "safe zone" once the outbreak began, and it was soon home to many of the children and parents that lived in the town. He played basketball with the students before the "biters" overtook the school. Once the zombies overran the school, they killed most of the people inside, while the others (including Caesar) ran for safety; an action he would always regret.

After-Apocalypse & Woodbury
Sometime after the school was overtaken, Martinez became one of the fence guards in Woodbury. He was also the guard who allowed Rick, Glenn, and Michonne into the town. While on a trip to see Dr. Stevens, he saw that The Governor had sliced Rick's hand off, and realized that The Governor was a monster. He then devised a plan to help Rick and party escape, (on the orders of The Governor of course) and fight their way back to The Prison which had become temporarily overrun.

Death
While the Tyreese and Axel were burning zombies, Martinez snuck out of the prison to inform the citizens of Woodbury of the location of the prison. However during his run back to Woodbury, he was run over by Rick in the RV; who had seen through his facade and had been chasing him down the entirety of the way. Martinez admited to being he sent by The Governor, but said that he planned only to bring the good citizens back to the prison, and not The Governor or his men. Rick however strangled him to death, as Martinez made him realize that Rick was just as brutal as The Governor.

Caesar's reanimated body was discovered by a Woodbury scouting party, and his head was brought back to Woodbury to be used as a form of propaganda for the governor to rally the townsfolk to lead a seige of the prison. Caesar's head was then kept in one of the jars that Governor Philip had in his appartment, as a form of "television".

Dr. Stevens
It is revealed that Martinez and Stevens were really good friends, but it haven't said pretty much more.

Rick Grimes
Martinez acted to Rick and others he were on their side, and almost forced them to get out of Woodbury, to show him where the Prison was.

Trivia

 * Robert Kirkman has stated that Martinez was meant to be homosexual, but this plotline was not pursued further.
 * In Issue 32, Glenn and Dr. Stevens called him "Rodriguez".