unabomber

"I thought back to the times I was home alone, forced to hide in a coat closet while my strange neighbor knocked on my door and peered through the windows."
The 81-year-old was found unresponsive in his prison cell early Saturday.
Kaczynski set off 16 bombs that killed three people and injured 23 others in various parts of the country between 1978 and 1995. He was arrested in 1996.
"You're a human being to us. You're still my brother."
Retired FBI agent Clint Van Zandt is NBC's go-to analyst for these tragically recurring events.