College of Southern Idaho said Chad Williams attended from Aug. 22, 2022, to Dec. 14, 2023, and left without earning a credential.
CSI records show the 24-year-old suspect had served as a student senator before being impeached in February 2023 for what a former student government officer called procedural reasons.
Twin Falls police say Williams opened fire at an In-N-Out on Saturday, killing 3 people and injuring 7, then died from a self-inflicted gunshot wound after acting alone.
Investigators still have not disclosed a motive or identified the victims; 2 injured people have been released, 3 are stable and 2 remain in critical condition.