Original:  A resident of the Indianapolis suburb of Westfield, Indiana, he was under investigation for murdering over a dozen men in the early 1990s, most of whom were last seen at gay bars.
Revised:  A resident of the Indianapolis suburb of Westfield, Indiana, Baumeister was under investigation for murdering over a dozen men in the early 1990s, most of whom were last seen at gay bars.
Edit intent: clarity