Police have not yet said why the gunman went to the theater, and if it was a random shooting or if someone inside the theater was targeted.
Local, state and federal law enforcement are investigating.
The gunman used a handgun during the shooting, police said.
Police said they found wigs and other material for disguises in his motel room and they believe he was going to try to escape from the theater alive and run from police. But he committed suicide as soon as the officers entered the theater.
“We found some wigs, glasses, things a person could use to maybe change their appearance,” Police Chief Jim Craft said at a press conference. “We don’t know if that was part of his plan, to enter the theater looking different than he looks and be able to escape. We know he switched the tag on the car because we found the license plate to the car in his motel room.”