A tracking device was put on Calkins' car in case he had dumped their bodies and went back to the scene, Hunter said, but again nothing turned up.
Disappearance of 2 Fla. men gets new attention →
"We've done what we could with it," said Hunter, now police chief in Marco Island, near Naples. "What I think it's going to finally come down to is whoever had more recent contact (than Calkins) with Mr. Santos or Mr. Williams."