Heuermann's 'House of Secrets' confession

Asa Ellerup, Heuermann's former wife, described a 'nervous' confession in which he admitted to carrying out the killings in their basement while she was away.

The details have sent shockwaves through the Long Island community, as it was previously believed the murders took place elsewhere.

Heuermann recently pleaded guilty to seven murders and is currently serving multiple life sentences.

The documentary, 'The Gilgo Beach Killer: House of Secrets,' promises to uncover fresh details about his double life and the failures of the initial investigation.