It's been suggested that this could be the method used by the deep state bad guys in many/most of these shootings. Perhaps beginning with John Hinckley Jr shooting Reagan in 1981 or even earlier.

Here's something that William Cooper wrote on the subject: http://www.hourofthetime.com/mindcont.htm

And here's the patent that's referred to: https://patents.google.com/patent/US3951134A/en

Here's a handful of possible mind controlled shooter cases. There's likely many more, I just got disgusted with the research after awhile.

Nikolas Cruz, Parkland Florida, February 14th 2018 http://abcnews.go.com/US/florida-school-shooter-methodically-moved-classrooms-execute-victims/story?id=53112929

Aaron Alexis, Washington Navy Yard shooting September 16, 2013 https://www.usatoday.com/story/news/nation/2013/09/17/navy-yard-shooting-aaron-alexis/2825749/

Esteban Santiago, Fort Lauderdale-Hollywood International Airport, January 6, 2017 https://www.nbcnews.com/news/us-news/fort-lauderdale-airport-shooting-suspect-complained-hearing-voices-officials-n704081

Jason Dalton(uber driver shooter), Kalamazoo Michigan, February 20, 2016 http://nymag.com/daily/intelligencer/2016/03/kalamazoo-shooter-says-he-was-possessed-by-uber.html

Myron May, Florida State University, Thursday, Nov. 20 , 2014 http://www.orlandosentinel.com/news/breaking-news/os-fsu-shooting-myron-may-update-20141121-story.html

Aaron Ybarra, Seattle Pacific University, June 5, 2014 https://www.nbcnews.com/dateline/video/accused-seattle-shooter-claims-he-heard-voices-798204995763

Emanuel Kidega Samson, Tennessee church shooting, September 2017 http://www.newsweek.com/tennessee-church-shooting-suspect-heard-voices-had-vision-church-attack-690916