the fatal bullet entered the car through the back window, hit the victim, and exited through the passenger side window. here, investigators got a lucky break. there was tinting film on the windows of the victim's car. >> had the vehicle not had tinting film, the tempered glass that was on the back window of the vehicle and on the passenger side vehicle would have shattered and probably been completely lost. >> the tinting film held the glass together. as a result, the bullet hole was still visible. shem took what was left of the passenger window and made a cardboard template, then recreated the bullet hole. he placed the template in the victim's passenger-side window. and then he conducted a simple test.