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Man who killed California cop claimed police had been bombarding him with ultrasonic waves

Among the evidence recovered from the home of a man who shot and killed a rookie California police officer were two unregistered guns and a letter claiming police had been bombarding him with ultrasonic waves.

Police in the city of Davis yesterday released the letter they say was written by Kevin Limbaugh.

The 48-year-old killed himself Thursday after fatally shooting Officer Natalie Corona.

Limbaugh wrote police targeted him with ultrasonic waves for years, saying "I can't live this way anymore."

This 2018 booking photo released by the Yolo County Sheriff's Office shows Kevin Douglas Limbaugh. Authorities identified the 48-year-old Limbaugh as the man who shot and killed Davis, Calif., rookie police officer Natalie Corona, 22, on Thursday, Jan. 10, 2019, and later took his own life during a standoff with police. The Sacramento Bee reports that court documents show Limbaugh was convicted in a battery case and agreed in November to surrender a semiautomatic rifle. (Yolo County Sheriff's Office via AP)
Kevin Limbaugh. Source: 1 NEWS

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

Detectives also found two semiautomatic handguns not registered to Limbaugh.

Limbaugh was ordered last fall to surrender a semiautomatic rifle after he was convicted in a battery case.

This Aug. 2, 2018 photo provided by Williams Pioneer Review shows Merced Corona, left, pins his daughter Natalie Corona's badge on her uniform during a swearing-in ceremony in Davis, Calif. Natalie Corona was shot and killed during a routine call Thursday, Jan. 10, 2019. (Williams Pioneer Review via AP)
Natalie Corona has her badge pinned on her chest by her police officer father, Merced. Source: Associated Press