The weapons were brutal: pipe bombs set inside harmless-looking packages that exploded when moved. The first victim, Steven Christensen, 31, a Salt Lake City businessman and Mormon bishop, was killed outside his office on Oct. 15, 1985. A few hours later in a nearby suburb, a second bomb took the life of Kathleen Sheets, 50, the wife of J. Gary Sheets, a former partner of Christensen.
The next day a third pipe bomb exploded in downtown Salt Lake City. This time, however, the victim survived -- and eventually became the prime suspect in the two murders. Authorities believed Mark Hofmann, a...