A&E The Killing Season 2016: Joshua Zeman & Rachel Mills Gilgo Beach investigation had David Schaller tip on a hulking 'John' and green Chevrolet Avalanche truck seven years ago, what he hell? NYP writes: The Long Island man whose tip proved key to nailing Gilgo Beach murder suspect Rex Heuermann wants to know why it took police more than a decade to follow up on his lead. “I gave them the exact description of the truck and the dude,” David Schaller said in his first interview since the accused serial killer’s arrest July 13. “I mean, come on! Why didn’t they use that?” Over the course of 18 months, Suffolk Country painstakingly built a case against Rex Heuermann, a suspect in the Gilgo Beach serial murders . A damning piece of evidence against him was a distinctive first-generation Chevrolet Avalanche. " When I heard that Rex Heuermann had a timeshare in Las Vegas, obviously my ears perked up. … Is he a gambler or is he going to an area that has a very robust vict...