Who is Ricky Robles from The Savage City: Race, Murder, and a Generation on the Edge and what is their importance?

Ricky Robles is the novel's antagonist. He is the real killer in the Career Girls Murder case. A twenty-one-year old junkie, Roble has a long series of crimes listed on his rap sheet. Roble's friends, Nathan and Marjorie Delaney, played a large part in his apprehension by the NYPD.