Patrick Rooney, 55, of Colchester, was arraigned on charges last month after police say he stole a document over 200 years-old from the Fletcher Free Library in Burlington.
Rooney was due back in court earlier this week to face more charges in connection to another theft.
When he did not appear at his Tuesday arraignment, police say they went to his home after receiving reports from family and friends that he had not been seen a few days. Police say he was found dead inside the home.
No foul play is suspected.
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