. >> dave shaffer is thankful he has his father. >> some of my best memories growing you are doing stuff with him. >> tonight, trying to find the person who saved his dad's life here at philadelphia international airport. shaffer has taken to social media contacting "action news" through facebook and posting his dad's story. >> my dad got up to go get a cup of coffee and my step mom stayed there at the gate. when he didn't come back she got a little worried. >> august 1 his dad, also named dave and his stepmother were in terminal d flying from phl to houston to surprise him at his retirement party when his dad had a heart attack. a nurse passing guy stopped to help the dad grabbing a nearby defibrillator. >> i strongly believe without the r.n. stopping by until the paramedics alive i don't think he would have made. >> they talked to everyone and don't know who the woman was. probably a passenger going on to catch her next flight. >> thank you first of all. that can't even come close to my gratitude. i just want to personally be able to thank them and tell them that welcome to the family.