These kinds of defendants don't refuse counsel. They will be happy to help sit at the counsel table attorney by his side. They just refuse to cooperate with the attorney. They smugly smile and won't talk. I've had plenty of clients like that. There are two choices, get the judge to permit an attorney withdrawal or continue with the case talking to other sources. Neighbors, family if they will talk, anyone who knows him and paid informants who know something. It isn't impossible to win such a case but it is really hard.