There is no word yet as to if the murder is linked to the cult. My guess is yes. These guys are religious nutters of the highest order. I'm sure some of it rubbed off on Koresh's mother and aunt.
Oddly enough, I did not catch this story in my Google new filter. I use the words "Waco" AND "Cult". I don't understand how it missed this murder. It catches everything else published about Koresh and the Branch Dravidians.