The Associated Press has obtained documents showing that James von Brunn, who died before he could stand trial in the shooting death of a Holocaust museum security guard, first came to the FBI's attention 47 years ago, when he was accused of making a death threat over a business dispute.

The FBI released documents about the 1963 incident in response to a Freedom of Information Act request from the AP.

Von Brunn denied making the threat, and authorities declined to prosecute.