Montano, who was believed to be homeless, had been committed to a mental hospital four times in the past year. He was reported missing two days ago.
Police also announced that he was armed with a pellet gun, along with an axe and pepper spray.
Montano was killed on the scene after opening fire on police. He injured one 58-year-old man with his axe, which the police also tweeted a photo of, and the man and two women, ages 17 and 53, were treated for pepper spray exposure.
The attack occurred during a screening of “Mad Max: Fury Road” Wednesday afternoon at Carmike 8 Cinemas in Antioch, a suburban community of Nashville. Montano had purchased a ticket to the film, and also brought a drink from a nearby Family Dollar before entering theater, said Nashville PD spokesman Don Aaron.
Montano also had a satchel and a backpack on him, the contents of which were detonated by a bomb squad. Police found that one of the bags contained a fake bomb.
The assailant sprayed a thick fog of pepper spray in the theater while wearing a surgical mask, presumably to protect himself from the chemicals. He was wearing a backpack on his chest.
No deaths aside from Montano’s have been reported.