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Watch the premier of CNN Original Series "The Hunt with John Walsh" Sunday July 13 at 9 p.m. ET.
(CNN) – There are some pretty horrific crimes making headlines. Like the case of Ron Lee Haskell, who is accused of killing six relatives of his estranged wife, four of them children. In this case, police have their suspect.
But many cases go unsolved, that's where John Walsh comes in. He spent more than two decades catching criminals on "America's Most Wanted," and now he's back fighting crime with his new CNN show "The Hunt".
"I've walked in all those shoes of the victims cases that I do," said Walsh, whose 6-year-old son was murdered in 1981. The case was not closed until 2008.
"It took 27 years, we always believed that Otis Toole, a serial killer, who had died eight years before Adam's case was (closed), was the guy who killed Adam," said Walsh.
For Walsh and his family, the day his Adam's case was closed "was a huge day for us. It did end that chapter," he said.
"There will never be such a thing as closure, we'll always be the parents of a murdered child, we're always going to have that hole in our heart," said Walsh.
For more of our interview with John Walsh, check out the video above.