It sounds like they haven't caught this guy yet . . . ? How disturbing.

In addition to the precautions you are already taking, you might also look into whether there are any self-defense courses for women in your area.

I took a course a few years ago that was offered by the university police where I was doing graduate work. They taught us how to break various types of holds that assailants tend to use on women, and we were able to practice hitting and kicking the officers (they wore pads). It doesn't obviate the need to use common sense, but it might be helpful if you ever did find yourself in a bad situation.