I'm so glad you brought that up! Well, I could if no one else wants the job... what we usually did (in the group that played in my dorm) was to let the murderer take over if he won or let a townsperson who wanted to take over if they won. (Taking turns so everyone got a shot at being narrator.)
If someone else wants to be narrator, they are welcome to... If someone else is going to do it, I'd prefer if it were someone who just played... just so they'll have gone through the steps with me.