State and local police were back at the home of suspected Gilgo Beach serial killer Rex Heuermann on Monday.

Investigators launched a second search of his Massapequa Park house nearly one year after they spent weeks combing through the property following Heuermann’s arrest.

Given the scope of the investigation, there are a lot of possibilities that could have triggered this new search warrant.

Law enforcement experts said police could have new information related to the “Gilgo Four” or the other Gilgo Beach murders, which Heuermann has not been charged with.

“If something comes up in the investigation that said ‘Hey, we didn’t have it on the first search warrant, we have to include it on a new search warrant,’ there’s probably new information, new leads or something else that was unforeseen in the first one,” said David Sarni, a retired NYPD detective and adjunct professor at John Jay College of Criminal Justice.

Law enforcement officials’ previous search warrants in the Gilgo Beach murder investigation were so extensive that some say it is hard to imagine anything was left out.

Team 12 Investigates previously obtained a 2023 search warrant for Heuermann’s car in South Carolina.

Police were looking for items such as journals, bills related to items that may have been used in the murders and electronics. They were also searching for documents containing passwords to online accounts, clothing that belonged to the victims and dozens of other pieces of property.

On Monday, Suffolk County’s medical examiner was seen arriving on scene, which law enforcement experts said is unusual for a search warrant.

“To me, if the medical examiner is there, that means they found something already,” said Michael Alcazar, retired NYPD detective and adjunct professor with John Jay College of Criminal Justice. “Medical examiners are typically very busy. For them to be on site, there’s something very revealing, something very important to the case that they recovered.”