By Marc Thompson

DAVIS (CBS13) — Investigators are releasing new information about the man they say shot and killed Davis Police Officer Natalie Corona.

Police say 48-year-old Kevin Douglas Limbaugh ambushed Officer Corona as she responded to a three-car accident near his home on 5th Street.

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Limbaugh, they say, shot Corona several times and fired shots at other first-responders in the area, striking a firefighter in the boot.

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New tonight, police say Limbaugh wrote a letter, shedding light on his deadly plan.

Davis Police say this is the letter written by Kevin Douglas Limbaugh

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Police say they have no reason to believe Limbaugh knew Officer Corona.

Yolo County court records show Limbaugh was arrested after assaulting a co-worker at the Cache Creek Casino Resort. He was charged with battery causing serious injury.

A previous booking photo of Kevin Douglas Limbaugh. (Credit: Yolo County Sheriff's Office)

A previous booking photo of Kevin Douglas Limbaugh. (Credit: Yolo County Sheriff’s Office)

That was reduced to a misdemeanor after a plea, but Limbaugh spent eight days in jail and three years on probation.

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No word yet on how he obtained the weapon he used to allegedly shoot Officer Corona.