Dereon Jayronne Kelly, 22, had been jailed since the Oct. 19 incident as a possible suspect in the case, but was charged Monday, The Bryan-College Station Eagle reported Tuesday.
The incident triggered the evacuation of the Texas A&M campus.
Brittany Nicole Henderson, 19, Kelly's girlfriend, was charged Thursday with three counts of making a terrorist threat in the Oct. 18 false alarm at Texas State University in nearby San Marcos, which caused the evacuation of three buildings on campus, the newspaper said.
School police officers, working with the FBI and other law enforcement agencies, served the warrant to Kelly in jail. The crime is punishable by a possible 10 years in prison.