Overview

• Tyler Robinson, 22, is in custody on aggravated murder, obstruction, and felony firearm charges in the killing at Utah Valley University.
• Daily Mail identified the roommate who turned over the messages as Lance Twiggs, though the affidavit does not name him or allege his involvement.
• Investigators cite messages about retrieving and stashing a rifle, leaving it wrapped in a towel, references to a scope and engraved bullets, and a change of clothes.
• Police recovered a Mauser .30-06 rifle wrapped in a towel in a wooded area near the campus shortly after the shooting, consistent with the messages.
• Authorities have not established a motive, and some outlets report a cooperating transgender partner, which officials have not confirmed.