EL DORADO, CA (CNN) -- He witnessed the 1991 abduction of his 11-year-old stepdaughter outside his home, and now Carl Probyn says he's still in shock that Jaycee Lee Dugard is alive.
But the circumstances of her captivity that police say was at the hands of a registered sex offender have left him in disbelief.
"It's kind of a shocker," Carl Probyn told CNN's "American Morning." "(Her) youngest child is the same age as Jaycee when she was taken."
Her abductor, Phillip Garrido, fathered two daughters with Dugard during her 18 years in captivity, police said Thursday. The girls, now 11 and 15, had been living with their mother, now 29, in a series of sheds behind Garrido's house in Antioch, California, until they were discovered on Wednesday, according to El Dorado County Undersheriff Fred Kollar.
Probyn said he is still in disbelief.
"I've probably done 100 interviews ... I haven't had time to think about anything," he said.
Police say Garrido's wife, Nancy, was with him when Dugard was abducted from the street in front of her house in South Lake Tahoe. Both are currently in police custody.
Probyn said hopes to see Dugard soon. He said he had lost hope over the years that his stepdaughter would ever be found.
"When it first happened, I was thinking, 'If I had my car keys, I would have chased him and done this and this,'" Probyn said. "But lately, toward the last few years, I just wanted an ending to this."