. >> we were notified that the individual who was driving this bulldozer was most likely marvin heemeyer. >> marvin was a commoner around town. he was well known. people knew him. many people considered him a friend. >> i met marvin heemeyer back in the 1990s. he ran a muffler shop in the town of grandby. and knew him just as a businessman. >> the motive is becoming clear, heemeyer's been harboring deep-seeded grudges against some prominent town members. this is his revenge. >> marvin was upset because a showman by the name of cody wanted to open a concrete batch plant adjacent to his muffler shop. mr. heemeyer felt this was not good for his property values and objected very strongly to the special use permit and the abonese in which the town went about proving this batch point. >> the plant is the main source of his anger, but heemeyer's also unhappy with the town council members for approving the plant's construction. his next target? is the grandby town hall. >> he began systematically from work failing a clockwise fashion going around that building and basically taking it down. >> an