DAVIS, Calif. — The man who shot and killed a rookie California police officer left a letter on the bed in the home where he lived claiming police bombarded him with ultrasonic waves, officials said.

Police in the college town of Davis on Saturday made pub­lic the one-paragraph letter they said was written by Kevin Doug­las Limbaugh, 48. He killed himself Thursday after fatally shooting Officer Natalie Corona.

Police spokesman Lt. Paul Dor­o­shov said the paper was found face up on the gunman’s bed.

“The Davis Police department has been hitting me with ultra sonic (sic) waves meant to keep dogs from barking,” the let­ter said. “I notified the press, in­ter­nal affairs, and even the FBI about it. I am highly sensitive to its affect (sic) on my inner ear. I did my best to appease them, but they have continued for years and I can’t live this way any­more.”

The handwritten note was signed “Citizen Kevin Lim­baugh.” Also recovered as ev­i­dence from the man’s home were two unregistered guns.

Davis police did not im­me­di­ate­ly respond Sunday to a tele­phone message seeking comment on whether Limbaugh had reported his claims to officials.

Investigators have not iden­tif­ied a motive for the ambush shoot­ing of the 22-year-old of­fi­cer as she investigated a car ac­cident.

The Sacramento Bee reported that court documents show Lim­baugh was charged and con­vict­ed in a battery case last fall, and he agreed in November to sur­ren­der the weapon.

The case stemmed from Lim­baugh getting arrested in Sep­tem­ber for assaulting some­one at Cache Creek Casino, Yolo Coun­ty Sheriff’s Sgt. Matthew Davis said.

Authorities have not de­ter­mined where Limbaugh ob­tained the two semi-automatic hand­guns he was believed to have used in the Thursday night attack that killed Corona.

Police said a gunman on a bi­cy­cle ambushed the officer, shoot­ing her from the shadows as she in­ves­tigated a car accident, then re­load­ed and narrowly avoided wound­ing others before walking home.

At his house a few blocks away, he casually chatted with his roommate as if nothing hap­pened and even went outside to watch as police from around the region began rushing to the shoot­ing scene, Davis Police Chief Darren Pytel said Friday.

The gunman left behind a backpack that helped police track him to the house.

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