. >> reporter: louie reyes is a real life hero, being credited with saving a man's life using his ownomated external defibrillator. >> mr. reyes absolutely saved this man's life. >> reporter: louie reyes was driving on the university of maryland campus sunday when he heard screams. >> someone call 911, does anybody have a defibrillator. >> reporter: he pulled over, jumped out, grabbed the aed from the back of his suv and went to work. a man had collapsed to the ground. bystanders including a local e.r. doctor were performing cpr. >> begin by removing all clothing from the patient's chest. >> reporter: reyes hooked up the aed to the semi conscious man. it der pulse. within 30 seconds, he was breathing and talking. within one minute, he was asking what's going on. >> reporter: reyes is being credited with saving the man's life. he says the man is improving at the hospital and thanked him for what he did. reyes had bought the device to protect his 10-year-old son who is a catcher on a baseball team. reyes was concerned if his son got hit in the chest with a fastball, he could need a shoc