There are connections between the shootings in the links below, to the school shootings and as far as I know these have not been solved.
I think you mean Tom Tancreado. He is my rep. He has had to tone down his RKBA rhetoric since Columbine, but he is still a pretty good supporter. I went to a town hall meeting in a TRT shirt. Some TRT folks pressed him pretty hard and he tried to be middle of the road during the meeting. He made some very encouraging remarks afterwards when I went to shake his hand.
The sandwich shop shooting remain unsolved. They may or may not be connected to Columbine but no money was taken
You are right about the influx of sociallist lefties here of late. Except for Denver it is still not too bad. We shall see what the future holds. I intend to move to the mountains in a couple years when I can retire. BTW, I work for the school district. Columbine is a very different place than it was before.