But Chief Charles Padgett says the signs of coming violence are only clear in hindsight.
Padgett was a detective when Steven Zelich was forced to resign following a 2001 internal investigation that determined Zelich has been stalking women while on duty.
Padgett says the violent end to Zelich's "very unique" story has saddened his department.
He says he and other officers keep thinking about the families of the women who died. He says he feels for them and the loss they are trying to deal with.