Grieving father: Son 'was my best buddy'

Alex Sullivan died in theater 9. It was his 27th birthday and he was just two days shy of his first wedding anniversary.

Earlier that night Alex tweeted: “oh man one hour till the movie and its going to be the best BIRTHDAY ever”

“He was my best buddy in the whole world,” his father Tom Sullivan tells Anderson Cooper. “I always went with him places. People would say, ‘Tom when I see you you’re always with your kids,’ and I said, ‘well that’s why you have them they’re supposed to be with you.’”

Sullivan says that going to the movies was a tradition. “We have always gone to the movies on his birthday,” he says. “We started back when he was 6-years-old.”

He also tells Anderson that Alex’s wife is coping with the loss.

“He was just such a fun guy and he was so empathetic,” Sullivan says to Anderson about his son Alex.