[UPDATE] Man who gunned down 22-year-old officer thought police were hitting him with ‘ultrasonic waves,’ cops say

New details continue to surface regarding the shocking ambush-style attack on a young police officer in California last week.

As CrimeOnline previously reported, 48-year-old Kevin Douglas Limbaugh was found dead from an apparent self-inflicted gunshot at a residence in Davis shortly after he gunned down 22-year-old Natalie Corona, who had responded to a nearby multiple-vehicle collision.

According to KKTV, Limbaugh left a letter investigators found on a bed in his home after his death.

In a statement on Saturday, police released the contents of the brief document signed “Citizen Kevin Limbaugh.” Investigators also allegedly found two unregistered firearms inside the residence.

Police Lt. Paul Doroshov indicated that officers found the handwritten note face up on the bed.

“The Davis Police department has been hitting me with ultra sonic [sic] waves meant to keep dogs from barking,” the writer began. “I notified the press, internal affairs, and even the FBI about it.”

The letter suggested that the writer was “highly sensitive” to the side effects of the alleged attack.

“I did my best to appease them, but they have continued for years and I can’t live this way anymore.”

It was unclear from available updates whether police had previous records of such complaints being filed by Limbaugh.

Davis Police Chief Darren Pytel said that Limbaugh “shouted some stuff” when he came out of the home to confront police.

He then stepped back inside and police heard a gunshot, sending in a robot to investigate and discovering the suspected gunman dead from a head wound.

[Featured image: Natalie Corona, handout]