Glasberg said a television network had obtained a copy of a novel Hatfill was writing -- about biological warfare -- that could have only come from the scientist's computer, which federal authorities have confiscated.
In the first letter, from Jan. 15, 1983, Chapman says his reason for writing, besides wanting to be Spiro's friend, is to ask for help in locating his copy of "The Catcher in The Rye, " which he was reading at the time of his arrest.