Crooks' parents contacted law enforcement in Bethel Park, Pennsylvania, to express their concern over their son's whereabouts hours before the attack.
Police immediately started testing the beverages after discovering suspicious substances floating in the cups and glasses inside the room.
Two more newly-released photos show Crooks' bicycle, which was found near the scene, and a remote detonator recovered from his body along with his cellphone.
Investigators are still trying to determine Crooks' motive, who had a minimal social media presence, and hope his phone may provide some clues.
Former University of Wisconsin-La Crosse chancellor faces dismissal from his tenured position over involvement in adult entertainment, following a faculty committee's unanimous recommendation and pending Board of Regents vote.
Thomas Matthew Crooks, who attempted to assassinate former President Donald Trump at a Pennsylvania rally, told his boss he needed Saturday off for "something important." His motive remains unknown, and the FBI is investigating the incident as a potential act of domestic terrorism.
Robyn Rogers, 44, was arrested and charged with three counts of sexual conduct with a minor.
The prominent developer reportedly poisoned Tatiana Pino, his estranged wife of 32 years, several times with fentanyl, as she claimed in their divorce case.
Brandi Elliott, 33, told cops she held her child underwater because she was having a "rough day" and her daughter wasn't ready to leave her alone.
Cooper Ouellette, 19, was charged with first-degree manslaughter in connection with the death of 17-year-old Sophie Ringquist in May 2023.
Crooks, 20, shot Trump in the ear during a rally in Butler, Pennsylvania on Saturday before being neutralized by the U.S. Secret Service.
Police spotted him at least twice 26 minutes before the shooting, but he managed to climb onto the roof of a nearby manufacturing plant without any challenge.
A leaked phone call reveals Donald Trump describing the feeling of being shot as "the world's largest mosquito" while discussing vaccines and a potential political alliance with Robert F. Kennedy Jr. The video, initially posted by Kennedy's son, has since been deleted, prompting an apology from Kennedy to Trump.
Former President Donald Trump received an enthusiastic welcome at the Republican National Convention, days after surviving an assassination attempt. Audio forensic experts suggest a second shooter might have been involved, prompting calls for a thorough FBI investigation.
Former Rolls-Royce designer Ian Cameron was killed in a stabbing at his mansion in Germany, in what police suspect was a failed robbery targeting his valuable car collection. His wife, Verena Kloos, survived the attack by seeking help from a neighbor.
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