Ask any criminal defense lawyer and he or she will tell you not to talk to police until you have a chance to talk to an attorney. It doesn't matter if you are guilty or innocent or know why you have been arrested or not; talking to police without consulting an attorney can be disastrous.
The problem is that once someone waives his or her rights to silence and an attorney, anything he or she says may be used by prosecutors. This evidence makes it incredibly difficult for a criminal defense lawyer to later negotiate a plea deal, to reduce charges, and, sometimes, to protect a client's rights. Just because someone is suspected of committing a crime, even a heinous crime, doesn't mean that his or her rights shouldn't be protected.