Cop killer claimed in note police targeted him with 'ultra sonic waves meant to keep dogs from barking' - Fox News

1. Cop killer claimed in note police targeted him with 'ultra sonic waves meant to keep dogs from barking'  Fox News
2. Gunman who killed California officer left note saying he was hit by 'sonic waves'  NBC News
3. Authorities ID suspect who killed Davis Officer Natalie Corona  KRON4
4. Police release strange letter from deceased man accused of killing Davis Officer Natalie Corona  KGO-TV
5. Police Release Cryptic Letter From Reported Cop Killer  CBS Sacramento
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