CCTV video from a shooting range in Russia shows a 15 year old student fatally shooting an instructor.
According to the info I got, the student is a 15 year old Russian boy who was a regular student at the range. On the day of the tragedy, he allegedly got in an argument with the instructor and ended up shooting and killing him. He then reportedly committed suicide by throwing himself under a passing train in Moscow.
Props to Best Gore member @refuse2renig for the video: