People don't know for sure is Skidmore actually killed his brother or not but the evidence is clear. There are three reasons Skidmore could've killed his brother, Skidmore's allergy to bubble gum, wealth, and becuase everyone loved Manchester and hated Skidmore.
Skidmore hated his brother without any reason to hate him. One reason could be that Skidmore took personal offense to his brothers attachment to sweet candy. Jealousy is a strong motive to kill. Skidmore was jealous of his brother as a person, not just for his wealth. Skidmore was jealous of his brother's personality, and his looks. Jealousy has enough power to consume a person. "The fame and riches it brought Manchester made it even worse", this quote brings power to fact that Skidmore