George Tiller - medical director of The Women's Health Care Services clinic was shot to death as he served as an usher during church services. He has long been a target of pro-life fanatics as the clinic is one of very few in the US which provide late-term services.
http://www.kansas.com/news/breaking/story/833730.htm
http://scienceblogs.com/pharyngula/2009/05/another_abortion_doctor_gunned.php#comments
http://en.wikipedia.org/wiki/George_Tiller