A former FBI agent says newly released federal documents show Thomas Crooks, the man who attempted to assassinate President Donald Trump, was “spiraling into an almost manic state” before the rally shooting.

The federal documents turned over to the Senate, first reported by the New York Post, show that people close to Crooks noticed odd behavior in the weeks before the attack, which killed one person and seriously injured two others.

Former FBI special agent Jonathan Gilliam told Fox News Digital that the documents turned over to the Senate contained several “red flags” about Crooks.

“These are definitely examples of somebody who is mentally not stable and also somebody who was spiraling into almost a manic or delusional state,” Gilliam said. “When you combine somebody who is delusional, somebody who’s hearing voices and is having almost a manic type of episode… with potential influence either by persons that they’re around or things that they see online… it’s very possible that that is the large part of this equation that we just have not seen.”

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While Crooks was “never into explosives,” an unclassified memo from the FBI states that an individual confronted him about “a gallon jug of something that he said was used to clean the bed of his 3D printer.”

The individual, who was redacted in the documents, didn’t believe Crooks’ explanation as his “ears would flame red when he lied.” It’s unknown when the individual confronted Crooks about the gallon jug.

That same unidentified individual said that Crooks began to “get more agitated” as he got older and “talked to himself a lot.”

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Republican presidential candidate, former U.S. President Donald Trump is whisked away by the Secret Service after shots rang out at a campaign rally at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. (Jeff Swensen/Getty Images)

“After community college he would talk to himself more and more, moving his hands and speaking to himself…sometimes Thomas would stay up dancing all night,” the individual said, noting he “seemed to have endless energy.”

The individual, who appeared to be close with Crooks, said that when confronted about the habit, Crooks would “admit to talking to himself” but denied hearing voices in his head.

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“Sometimes he would stay up all night, always endless energy,” an FBI notepad read.

The individual who appeared close with Crooks described his nighttime behavior to the FBI.

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Thomas Matthew Crooks was a 20-year-old from Bethel Park, Pennsylvania, who attempted to assassinate former President Donald Trump during a 2024 campaign rally before being shot and killed by Secret Service agents. (Associated Press | Fox News Digital)

“THOMAS would be in [redacted] at night and it sounded like he was dancing and whispering each night. About two to three times each week, he would pace through [redacted] When [redacted] confronted THOMAS about the pacing, THOMAS would say that he was bored and trying to entertain himself. [redacted] worked [redacted] and the pacing was [redacted] distracting [redacted],” the FBI memo stated.

One of Crooks’ coworkers told law enforcement that in the weeks before the attack, he “opened up a little more” and became more “excited about going to school.”

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Crooks was planning to attend Robert Morris University to study mechanical engineering and graduated with an associate degree in engineering science from the Community College of Allegheny County.

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A flag is displayed as attendees look on, during Republican presidential nominee former U.S. president Donald Trump’s campaign rally, as he returns to the site of the July assassination attempt against him in Butler, Pennsylvania, U.S., Oct. 5, 2024.  (REUTERS/Brian Snyder)

In the months before the shooting, Crooks also enrolled in the following courses at the Keystone Shooting Center:

• Basic Carbine Course, enrolled April 30, 2024, scheduled for May 25, 2024 — $139.99
• Basic Handgun Course, enrolled June 7, 2024, scheduled for June 13, 2024 — $139.99
• Intermediate Handgun Course, enrolled June 1, 2024, scheduled for June 22, 2024 — $149.99

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Around the time Crooks was taking these firearm courses, he was spotted with two people at Keystone Armory in Edinboro, Pennsylvania, on May 25, 2024, where be bought 20 rounds of Red Army 7.62x54R for $19.07.

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“The individual believed to be Crooks was accompanied by a white male believed to be around his mid 30’s and another older white male with a gray beard, potentially one of the individual’s father. The individual believed to be Crooks and the two other males can be seen wandering throughout the firearms store looking at various firearms,” the FBI document stated.

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The documents also make reference to a redacted individual, believed to be Crooks, “purchased ammo online going site to site until he found one that would sell to him.”

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Republican presidential candidate former President Donald Trump is rushed offstage by U.S. Secret Service agents after being grazed by a bullet during a rally on July 13, 2024 in Butler, Pennsylvania.  (Anna Moneymaker/Getty Images)

FBI Director Kash Patel testified on Tuesday at a Senate Oversight Committee hearing that there’s no evidence that Crooks was connected with anyone else.

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“We found no evidence that that individual was literally even speaking to any other human being other than his parents, who he resided with,” Patel testified.

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The documents show the FBI contacted at least one foreign government during its investigation into the assassination attempt, but offer no further detail on why.