Forensic criminologist and self-defense expert “DrRon” Martinelli, discusses the forensic  investigation, evidence and self-defense issues behind the civilian self-defense fatal shooting of N.Y. Jets running back Joe McKnight (28) by Ronald Grasser (54) on a street outside of New Orleans this past weekend. So far, Mr. Grasser has not been charged with murder in the case which is already experiencing racial overtones and false narratives spread through social media by Black Lives Matter advocates. Watch and share.