Mr Godwin was just walking down the street on Easter Sunday when Mr Stephens pulled up to him and shot him in the head.
The interview with Cooper came after Godwin's daughters met with Joy Lane, the woman Stephens repeatedly blamed for his problems in videos uploaded to Facebook around the time of the killing. But Stephens did not wait, he said.
"We told him his fries were going to be a minute", said Henry Sayers, the restaurant's manager.
While authorities have not found any evidence that he killed anyone else, the manhunt for Stephens stretched into a third day on Tuesday and far beyond the neighborhood where police said he shot a 74-year-old man who was picking up aluminum cans on Sunday after spending Easter with some of his children. "He didn't want to wait for his fries".
According to the owner, Tom Ducharme Jr., the suspect, Steve Stephens, placed an order then drove to the window. He took his McNuggets and whipped out of the parking lot, almost hitting Gail Wheeler, 54, a retail operations manager from Erie who was on her way home from the grocery store.
Ms Wheeler followed behind for a couple of miles and said the chase slowed suddenly from 50mph to about 20mph when the road narrowed from four lanes to two.
Troopers in marked patrol cars initiated a pursuit that lasted two miles.
Said DuCharme: "I am pretty sure he figured out that we were on to him".
"I heard a shot", the witness recounted.
"It was loud and distinctive".
"When I saw him I knew it was him". The one officer just shook his head.
Another employee stalled Mr Stephens until Pennsylvania State Police arrived.
Stephens posted a video of himself killing Robert Godwin Sr., a former foundry worker who had 10 children, police said.
"I could not do that if I did not know God, if I didn't know him as my God and my savior, I could not forgive that man", she said.