Mark's Law - for Firefighters, EMS/Paramedics, First Responders and Volunteers while on duty

On January 30th, 2009, my son, Mark B. Davis went on a fire/ambulance call in Cape Vincent, NY. The patient, he was called to help, shot and killed him. His killer received a sentence of 16 yrs. The Second Degree murder charge was plea bargained down to where, he could have served a sentence of less than 5 yrs! Mark's killer received 16 yrs, will have to serve 6/7th's of the time and with good behavior, will be out in approx 11 yrs. Does anyone think that is fair?
I propose to make a REASONABLE, FEDERAL, Law that states: Any crime committed against a Firefighter, EMT/Paramedic, First Responder or Volunteer while in the line of duty, that results in death, will carry a mandatory charge of First Degree Murder. The First Degree Murder charge is a lifetime sentence with no chance of parole.