House of Secrets” takes viewers inside the Massapequa Park home of alleged serial killer Rex Heuermann. And for the first time, both Heuermann’s estranged wife and his daughter discuss the case, highlighting a difference of opinion on the question of the New York City architect’s guilt.

The family of accused Gilgo Beach serial killer Rex Heuermann has gotten a helping hand from an unexpected source: The daughter of a notorious jailed murderer.

The man's daughter believes he's "most likely the Gilgo Beach killer" based on evidence and information in the case, according to the family's attorney.