As someone who's never had to hire a lawyer for anything, and also someone with the normal vested social interest in how I am perceived, I don't even know what I would do if I was the target of such an investigation. Imagine being Mr. Family Man, maintaining a hum drum life, and then suddenly being in this position. Where would I even start?
When I need a professional, I usually reach out to my friends and neighbors for advice. "Hey, I need some minor repairs, anyone know someone reputable in the area?" Extrapolate that to a double murder. "Hey, so I'm being looked at for that famous double murder from five years ago. Anyone know a good lawyer?" Add potential death-penalty case and small town to the mix, and I'd imagine I have no choice but to request a public defender.