Davy Jones

In the Mirage TMNT continuity, Davy Jones is the only brother of. In Tales of the TMNT volume 2 issue 37: Casey in Point, Casey tells his new friend Jim about Davy.

History
When Casey and Davy were growing up in the Bronx, Davy was the overachieving brother who did well in school and had a promising future in sports, while Casey was an underachiever who did very little work and mostly dedicated himself to girls, comic books and street art. It is Davy's brutal death at the hands of street thugs that motivates Casey to become a street vigilante.

After Casey is done telling the story, the bartender Jesse reveals that none of the story is true&mdash;Casey is an only child, and Davy never existed.

Trivia

 * Not only did Casey and Davy never grew up in the Bronx, but Casey is actually from Brooklyn.