How 'untraceable' burner phones helped police bust alleged Gilgo Beach serial killer

Alleged Gilgo Beach serial killer Rex Heuermann used burner phones to lure his victims to their grisly deaths, but the devices also helped police catch him, according to experts.

"The more you use the phone, the more there’s a pattern and patterns are what catch you," said Frank Thornton of Blackthorn Digital Forensics. Rebecca Rosenberg is a veteran journalist and book author with a focus on crime and criminal justice. Email tips to rebecca.rosenberg@fox.com and @ReRosenberg.

Heuermann, 59, was arrested last Thursday for the murders of Megan Waterman, 22, Amber Costello, 27 and Melissa Barthelemy, 24, whose cellphone he allegedly used to make taunting phone calls to her sister.