The registered Republican and 2022 high school graduate opened fire at the former president with an AR-style rifle from a roof 130 yards from the rally stage in Butler, Pennsylvania , on Saturday at 6.15pm.

Images of Crooks wearing glasses, braces, and an American flag t-shirt in a yearbook headshots emerged on Sunday morning, hours after he tried to take out the presumptive Republican nominee and killed a member of the rally crowd.

Crooks was a dietary aide at Bethel Park Skilled Nursing and Rehabilitation Center - where he provided food and care for post-hospital elderly and sick people. 

His employer confirmed on Sunday that he had a clean background check and 'performed his job without concern' before he attempted to kill Trump. 

In unprecedented scenes of terror, Trump was seen grabbing his ear and dropping to the ground as Crooks' gunshots rang out and sent the crowd into a frenzy.

Moments later, he got up and raised his fist and shouted 'fight, fight, fight' as the Secret Service escorted him to a motorcade and then to hospital.

Crooks' uncle Mark Crooks told DailyMail.com he hadn't seen the gunman or his parents in years, and described them as 'very private'.

'I haven't seen that part of my family in years,' he said. 'Honestly it's been so long I don't think much about them

'It's a shame. The kid is like a stranger to me. They're private and they don't reach out to anybody any time.'

Bethel Park School District - where Crooks was a student until two years ago - verified his graduation and vowed full cooperation with investigators.

Records show he donated to a group who backed President Joe Biden on the day of the inauguration in 2020.

A resident near to where Crooks lived, who wanted to remain anonymous, confirmed the identity of the gunman to DailyMail.com.