"The Davis Police department has been hitting me with ultra sonic (sic) waves meant to keep dogs from barking", the letter said.
Authorities say Limbaugh then returned to a home nearby and went inside to talk to a roommate then went back outside to watch the chaotic scene as first responders flooded the area to help the officer and search for the suspect.
Investigators also found two semiautomatic handguns inside the house, a 9 mm and a.45-caliber, not registered to Limbaugh, Doroshov said.
Corona started at the Davis Police Department as a part-time employee in 2016, when she was a junior college student.
The Yolo County Sheriff's Office says the man suspected of killing Davis Police Officer Natalie Corona has been identified as 49-year-old Kevin Douglas Limbaugh.
After hearing a single gunshot inside, the officers sent a robot where Limbaugh was found to have fatally shot himself in the head. I notified the press and internal affairs and even the Federal Bureau of Investigation about it. I am highly sensitive to its affect in my inner ear.
"This clearly to us looks like an ambush", Pytel said.
Limbaugh was ordered last fall to surrender a semiautomatic rifle after he was convicted in a battery case. Her father, Merced Corona, served 26 years as a Colusa County Sheriff's deputy, the Beereported.
The memorial service for slain Davis Police Officer Natalie Corona will be held at 11 a.m. Friday at the Activities and Recreation Center, or ARC, on the campus of UC Davis. As of Thursday, he said he had no information as to whether she was targeted, and he wasn't sure if someone involved in the crash pulled the trigger. "She just worked like you can't believe".
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 did my best to appease them, but they have continued for years and I can't live this way anymore", the letter read in part.
Her devotion to the department and Davis community was put on display Saturday night, where more than 1,000 mourners gathered for a candlelight vigil in her honor.