How do you kill people w/out having your bounty go up? I've killed people, not alerted the guards, and yet my bounty goes up?
I always pit the blame on the Grey Fox.
Otherwise, as TheNord mentioned, frenzy or as Acadian calls it, "Suicide by Guard". A maxed power frenzy spell mixed with a maxed power rally spell works on most anyone who doesn't have a high responsibility (like the guards). Duration of the spell can be optional. 100% chameleon could work too, although in some cases like offing the stable hands at the IC Stables is guaranteed to get you a murder bounty no matter what (even with 100% chameleon).