Woman Scorned:
...an FBI agent said that Brock’s ex-wife was among those who contacted the Bureau telling investigators, “I just know that when I saw this was happening, I was afraid he would be there. I think you already know he was there. It is such a good picture and I recognize his patch," the affidavit said.
https://www.nbcdfw.com/news/local/fbi-arrests-grapevine-man-photographed-in-tactical-gear-on-us-senate-floor/2524718/