The day after the shooting in the Hudson Valley Mall , in which two people were wounded , details emerged about the suspect , Robert Bonelli Jr. , who was described as a loner who secluded himself in his bedroom at his father 's home in Glasco , a hamlet in Saugerties , N.Y . In Mr. Bonelli 's room , the police found piles of news articles and other accounts , photographs and documents printed from the Internet , all related to the 1999 shootings , said Donald A. Williams , the Ulster County district attorney . ''