Marion Setzer, 72, wife of former Tennessee lawyer, John Setzer, 74, died on Wednesday night after a packaged bomb went off after John, who died on Monday, had taken it from their mailbox around 5 p.m.
According to CNN, investigations found a note that could have been attached to the packaged bomb however no other information was given about it.
Neighbor, David Hughen, told NY Daily News that, "With the house as well-built as it was, it had to be a huge explosion. It's just a huge mystery that a terrible thing has happened to good people." The Setzer’s home was built four years ago on Vance Lane in rural Tennessee.
The 72 year old was taken to Vanderbilt University Hospital after the blast on Monday. The former lawyer was known for his cases on bankruptcy. He was killed immediately following the detonation.
Authorities are offering an $8,000 reward for anyone who has more information about the attack. The investigation is ongoing.