Erron Marston, born during the wild west era, was just your normal boy living a normal life with his Ma and Pa. Until one day when a gang of outlaws came. The outlaws were after Erron's father, Troy Marston. Troy had his wife and son hide in the farm while he dealt with the outlaws, but unfortunately, he was shot down by them. Erron and his mom stayed quiet as possible in the farm as the outlaws robbed their house and searched through the farm too, but Erron and his mother stayed hidden and managed to not get themselves caught. After the outlaws left, Erron ran to the body of his father and began to cry along with his mother.

Three years later, at the age of 12, Erron's mother had unfortunately passed away from tuberculosis, leaving Erron an orphan. With no family and no home, Erron stayed at a city, usually stealing food or money from people until one day, he met a man that he tried to steal his wallet from, but little did he know, the man he just robbed was the leader of the infamous Crispin gang, Dutch Crispin. After he caught Erron and got his wallet back, Dutch learned about Erron's past and decided to bring him into the gang, raising Erron like he was his own son. When brought in, Erron met another boy around his age. The boy introduced himself as Jack Mcree and the two shortly became friends. There was also Joseph Bell, the second in command of the gang, and other father figure to Erron and Jack.

As they grew up, both boys would be trained by Dutch and as they got older, became full on members of the Crispin gang. The Crispin gang would commit several heists and steal money. Erron became Dutch's right hand man of the gang. Dutch had a dream where they would quit the outlaw life and move to a place that they can call paradise once they got enough money. Unfortunately, things would begin to go downhill when a new member, Ross Milton, was recruited into the gang when Erron was 24. Ross was a more wild man compared to some of the other members and most members don't think highly of him, including Erron and Jack. One of the worst things he ended up doing was shooting up half of a town and committing a massacre. During his time in the gang, Ross would slowly begin to earn and manipulate Dutch's trust, much to the suspicion of Erron and Joseph. While Jack did not trust Ross, he still chose to follow Dutch's side. Aside from Ross, the Crispin gang dealt with federal agents and rival gangs, costing them the lives of fellow members of the gang. Dutch slowly started to lose his mind and blindly accepted advice from Ross. Erron knew that things would get worse if this kept happening and tried to tell Jack, but Jack refused, still choosing to follow Dutch to the end.

Erron would finally have enough of everything during a heist, where Erron was shot by the federal agents, and fell of the train where the heist was happening. Before losing consciousness, Dutch and Ross had arrive to see if he was ok, and that's where Ross convinced Dutch to leave him for dead, and they left, Erron lost consciousness afterwards. After waking up, Erron decided to put matters into his own hands and headed to the camp where the Crispin gang resided and confronted Dutch and Ross. Jack had gotten captured by the Federal Agents but managed to escape and was heading back to the camp. While this was happening, a shootout occurred at the camp. Ross and Dutch tried to escape but Erron caught up to them and shot down their horses. Cornering the both of them at a bridge that had previously been destroyed, leading to a cliff that had a river at the very bottom.

With one final stand off, Erron, Dutch, Ross, fired at each other. Erron was hit in the shoulder, Dutch was shot in the stomach and fell down, and Ross was shot in the throat. Ross stumbled and fell of the bridge, falling all to the bottom and landing into the river, finally dying. Dutch was still alive but bleeding to death. Erron walked up to him and stared at the man he once treated like a father. Erron then finally pulled the trigger, killing Dutch for good. Erron slowly walked away, filled with grief. After he left, Jack had arrived and found Dutch's body. Since most of the other members were dead, Jack knew that Erron was the one responsible. Feeling betrayed by the man he called his brother, Jack vowed to get revenge.

Four years later, Erron is now 28 and roaming the land. Becoming one of the most infamous bounty hunters in the country. While visiting a city, Erron encountered a man who had an interesting appearance. He wore a grey cloak, all black clothing, and a red scarf with different colors on it. The man had very pale skin, red and blue eyes, and black and white hair. The man introduced himself as Death Maniac and gave Erron an opportunity. He wanted him to join his group, a group known as Killswitch. Erron at first refused but decided to join when Death told him that there was a great threat to the Earth and the universe itself. This threat would be known as the Nemesis Order.

Erron joined Killswitch and gained the ability to control sand and for his body to never age. Erron became one of the most well known members in Killswitch. He is also regarded as the most skilled gunslinger in the world. Until the Nemesis Order is defeated, Erron will serve Killswitch to the end.

Death out