Say nothing. Call your attorney. Your attorney will quickly explain that you are so stunned and distraught that you called him as a friend for support, not so much as an attorney, and that he, your attorney is here to see that they, the police, get the best and proper cooperation, something they would not get from you not because you are uncooperative, to the contrary, because you are so distraught at the loss that you are essentially incoherent.
If you have made no statements then there is nothing to misconstrue. You may think that a prosecution could paint you as uncooperative if you don't participate. First off there is far less chance there will ever be a prosecution of you, and second, your attorney can easily sell you were distraught to the point of incoherence, as would be any innocent man, and you were cooperating by bringing in a professional who knows you and could answer all of the police proper questions professionally, to expedite the search for the killer.
Any statement can be misunderstood, misheard, or misconstrued, any statement. Perhaps you can explain to me what you might gain by talking to them. Be specific in what you would say and the rest of us can have fun deliberately trying to misconstrue your innocent help as something sinister. I bet we can do so.