Published: Feb 13, 2014 2:28 PM EST

LEBANON, Tenn. (AP) - Authorities say a second person has died from injuries suffered when a package exploded in a rural Tennessee home.
    
The Tennessee Bureau of Investigation says 72-year-old Marion Setzer died Wednesday evening at Vanderbilt University Hospital. Her husband, 74-year-old Jon Setzer, died Monday in the blast at the couple's home in Lebanon, about 40 minutes east of Nashville.
    
Friends of the couple said they were shocked by the news of the Setzers' violent deaths. They said they could not imagine who would want to harm the retired attorney, who had serious health problems, and his wife.
    
Agents from the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives are also investigating.

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