Alex Martin, 25, died in March 2012 when stun gun ignited gas fumesVideo released during family lawsuit against Border Patrol agentsA blue Ford Focus rental car erupted into a ball of flames with 25-year-old Alex Martin inside it, after a US Border Patrol agent broke the car’s passenger side window and shot a Taser into the cab, igniting gas fumes inside.The blast was so strong it blew agents backwards, leaving them to recoup before they moved their cars away from the burning small car without attempting to help Martin.