Heuermann's neighbor says he heard him digging in the backyard

The next-door neighbor of the Gilgo Beach serial killer suspect has claimed he heard Rex Heuermann digging in his backyard in the early hours of the morning.

Heuermann has been arrested and charged with the murder of three of the 'Gilgo Four', Melissa Barthelemy, Megan Waterman and Amber Costello, whose bodies were found on the Long Island beach in 2010.

The neighbor's eerie claim, alongside recollections of a pattern of odd behavior such as burning garbage, comes after police said was killed in Heuermann's Long Island home.

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