I understand your poimt about taking risks, but I'm not so sure that having a lawyer would actually make them suspect you more than a mistake on your part would if you went it alone. All it would take is one error on your part, one slip of the tongue, one mistake that a lawyer could have prevented, and that would significantly delay the arrival of the day you are talking about. For obvious reasons, the police are going to focus on family members first, so while I agree with you that cooperation is a smart move, it's also wise to know how to approach that cooperation. A local lawyer will know the local police department and how they operate.
There is story on the Montgomery Advertiser website, however it is a Gannett paper and we are not allowed to post stories from there.
And as for cooperation being a "smart move",I'd be more inclined to refer to it as "the logical and right thing to do for many different reasons".