how could i possibly know he would do a thing like that? >> cheryl met joseph andrew stack through a mutual friend in 2005. both loved music. cheryl played piano, joe played bass guitar. two years later, in a small ceremony in austin, they married. joining them was cheryl's 12-year-old daughter, margo. did he ever talk about how he was angry with the government, angry with the irs? >> when we were dating, he did talk about the irs. he didn't seem so angry. he just didn't like them. >> reporter: but actually, joe's emotions ran much deeper. in the '80s while living in california, he was part of an anti-tax movement, even forming his own tax exempt home church. his run-ins with the irs continued for decades. joe and cheryl got audited in