Reinking's parents called cops after he claimed the Grammy-winning pop star was stalking him, CNN reports.
Documents obtained by the channel's affiliate WBBM from the sheriff's office in Tazewell County, Illinois, also suggest a "troubling pattern involving guns" and "delusional behaviour".
The 29-year-old's past is being investigated as the hunt for him continues in connection to yesterday's shooting that left four dead in Antioch, near Nashville, Tennessee.
The shooter brandished an AR-15 rifle before opening fire and only fled the scene after a diner James Shaw Jnr bravely wrestled his weapon from him and threw it over the counter.
It has since been reported Reinking had weapons – including the rifle being linked to yesterday's shooting – removed after he was arrested near the Presidential landmark in Washington last year.
A Secret Service agent told the Associated Press Reinking had hoped to talk to President Donald Trump.
Special Agent Todd Hudson revealed Reinking "wanted to set up a meeting with the President."
He added Reinking tried to cross bike racks near the White House grounds that were part of security barriers. The US Secret Service then arrested him for being in a "restricted area".
The seizure of the suspect's weapons came less than two weeks after a Tazewell County sergeant said Reinking drove up to his squad car and and asked about filing a report.
Reinking told the sergeant that people were "tapping into his computer and phone" and barking like dogs outside his home, according to an August 11 incident report.
He said he felt like he was being watched and that people were baiting him into breaking the law, the report states.
He told the officer that it all started after he started writing to Taylor Swift.
Officers released the firearms and ammo to Reinking's father, Jeffrey, the report says.
Investigators now believe that he returned the guns to his son – and believe two of them could still be in Reinking's son.
The suspect is said to have arrived at the diner wearing a green jacket with nothing underneath before taking off the coat and opening fire.
Police have named 29-year-old Reinking as a person of interest as the vehicle the gunman arrived in was registered in his name.
They say he is believed to have been seen at an apartment complex near the scene wearing black pants and no shirt.
A spokesman added Reinking is known by authorities to have had an interest in firearms.
Witnesses described a man walking away from the scene following the massacre.
A Nashville PD spokesman said: "Four people were fatally shot and two others wounded. The gunman opened fire at 3.25am. A patron wrestled away the gunman's rifle. He was nude and fled on foot."
Police have identified victims killed in the shooting as employee Taurean Sanderlin, 29 and diners Joe Perez, 20, Akilah Dasilva, 23, and a 21-year-old woman whose family hasn't been notified.
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