Authorities released shocking surveillance footage of the moments a Florida dad of three was gunned down in his SUV as he tried to flee his killers days before his daughter’s birthday. The Broward County Sheriff’s Office made the video public in hopes someone will recognize the two men seen fleeing the chaotic, middle-of-the-night scene July 3. Deputies responding to a call of shots fired followed by a car crash in a Tamarac, Florida neighborhood discovered 25-year-old Christopher Mathurin dead in his vehicle from apparent gunshot wounds. Area surveillance footage captured the sounds of dozens…