For nearly 40 years, two of America’s most haunting unsolved mysteries ran on separate tracks. One was a man with no name who died in a Boise church. The other was a faceless killer who terrorized the nation by lacing Tylenol capsules with cyanide.

A far-right activist best known for his showdowns with federal law enforcement in Oregon and Nevada is now waging a one-sided standoff of a different kind in Idaho.