The man, a father of four, is OK. He survived after having a heart attack while driving on the service road of I-90.
Medics got to him in time, thanks to a woman who was driving behind him.
She saw his car driving erratically and followed him to where he rolled to a stop.
The stranger got out of her car and checked on him.
She called 911 to report that he was unconscious and asked for an ambulance.
Alan Winn's family later learned the woman stayed with him until medics arrived and revived him.
He spent three days in ICU, where his family learned about the stranger who got him the help he needed, when seconds really counted.
"He would not be here today if she hadn't decided it was important to stop and see if he was OK," said Joy Winn, Alan's wife. "And she immediately called 911 and they were there within five or six minutes."
His heart attack was on Saturday.
On Monday, Alan Winn's kids went to the police department to ask for the Good Samaritan's information.
When they were initially told "no," the Joy got on Facebook to spread the word. It worked.
The family learned the lady is from Garland and she is no longer a stranger.
The families have just connected and had a chance to meet after the ordeal.