I don't believe this guy knew his victims....
http://www.trutv.com/library/crime/...ily/hennis/overkill-three-brutal-murders.html
Kara, 5, had been stabbed repeatedly. Erin, 3, had been bludgeoned to death. Kathryn "Katie" Eastburn had been tied up, apparently raped, and stabbed fifteen times. Those injuries were more than enough to kill the woman and the two girls; in a shocking example of what police call "overkill", the attacker had also slit each of their throats.
This case always reminded me of the Dyleski case.