The man who killed Officer Natalie Corona in an "ambush"-style attack left a note in the apartment where he killed himself, claiming that police had targeted him with "ultra sonic waves meant to keep dogs from barking".
Davis police confirmed a typed letter was found inside Kevin Limbaugh's home.
Fallen Davis Police Officer Natalie Corona is seen in an undated photo shared by Los Angeles County Sheriff Alex Villanueva on January 11, 2019. "I am highly sensitive to its affect [sic] on my inner ear", the letter reads. "I did my best to appease them but they have continued for years, and I can't live this way anymore", said the note, which was signed, "Citizen Kevin Limbaugh".
Investigators found a note in Limbaugh's home.
In November, Limbaugh was ordered to turn in a black.223 Bushmaster AR-15 semiautomatic rifle.
Limbaugh had been involved in a fight in September with a co-worker at Cache Creek Casino Resort, about 40 miles northwest of Sacramento, according to police and court records. Authorities do not how Limbaugh came to possess the guns he used in Thursday night's shooting.
Limbaugh dropped his backpack at the scene and information inside allowed police to trace him to a house about a block away.
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Witnesses told police the suspect left a backpack at the scene. The chief said as police began to surround it, he stepped outside wearing a bulletproof vest.
"There have been a lot of rumors as to why this happened, why he did what he did, and we're hoping this sheds some light", Doroshov said.
Police found the handguns in the home.
Corona started volunteering as a community service officer with the Davis Police Department after she graduated from high school and for a time work at the department even after funding for her position ran out.
Corona was the first officer in the department to die in the line of duty since 1959.
"She was a rising star in the department", Pytel said.
A candlelight vigil for the slain officer was held Saturday night.