(AP) — Documents show a doctor fired from his medical residency at Omaha’s Creighton University in 2001 is suspected of carrying out two attacks that left four people dead after being denied medical licenses in other states.

Illinois State Police arrested Dr. Anthony Garcia, of Terre Haute, Ind., during a traffic stop Monday in southern Illinois. He remains jailed there without bond.

He is suspected in the 2008 stabbing deaths of Creighton pathology professor William Hunter’s 11-year-old son and housekeeper. Garcia is also suspected in the May deaths of Creighton pathology professor Roger Brumback and his wife, Mary.

Documents provided Tuesday by Indiana officials show the 2008 killings occurred a month after Garcia was denied a Louisiana medical license. The May killings occurred within months of Garcia being denied an Indiana license.