Grant testified Friday that authorities tried to track down the sender of the letters by using a list of Wicker's constituents with the initials KC, the same initials in the letters. Grant said the list was whittled from thousands to about 100 when investigators isolated the ones who lived in an area that would have a Memphis, Tenn., postmark, which includes many places in north Mississippi. He said Wicker's staff recognized Curtis as someone who had written the senator before.
Grant also testified that there were indentations on the letters from where someone had written on another envelope that had been on top of them in a stack.
The indentations were analyzed under a light source and turned out to be for Curtis' former addresses in Booneville and Tupelo, though the street name in one of the addresses was spelled wrong, Grant said.
All the envelopes and stamps were self-adhesive, Grant said Monday, meaning they won't yield DNA evidence. He said thus far the envelopes and letters haven't yielded any fingerprints.
McCoy said the evidence linking the 45-year-old to the crime has hinged on his writings posted online, which were accessible to anyone.
Much of Monday's testimony focused on Curtis' prior run-ins with police and evidence about his mental health.
"The fact that this man may be suffering from a form of mental illness, how does this make it make it more likely than not that Mr. Curtis committed to these crimes?" McCoy asked.
Grant said that it didn't, but said past evidence about mental state, "helps establish a potential behavior background for Mr. Curtis, perhaps not realizing what he's doing."
Follow Jeff Amy at http://twitter.com/jeffamy
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