Man Who Killed Officer Said He Was Hit by Ultrasonic Waves

Authorities identified the 48-year-old Kevin Douglas Limbaugh as the man who shot and killed Davis, Calif., rookie police officer Natalie Corona, 22, on Jan. 10, 2019, and later took his own life during a standoff with police. Yolo County Sheriff's Office via AP

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 near Sacramento 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.