Gilgo Beach murders: Massapequa Park's Rex Heuermann arrested

Rex Heuermann, the suspect in the Gilgo Beach murders that began in 2007, has been arrested.

Heuermann was arraigned, pleading not guilty to six counts of first and second degree murder.

Heuermann is accused of killing Amber Costello, Melissa Barthelemy, Megan Waterman, and Maureen Brainard-Barnes.

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Evidence against Heuermann includes matching DNA, cell records, and a car described by a witness.

Authorities launched a comprehensive investigation into Heuermann, including over 300 subpoenas and search warrants.

Neighbors were shocked by his arrest, describing Heuermann as a quiet person who never caused trouble.