"Four bodies found in the same location pretty much speaks for itself. It's more than a coincidence. We could have a serial killer," Dormer told ABC News Tuesday.
Police combed the area for what they fear may be more victims Tuesday until the darkness forced a halt to the search.
The first body was found Saturday during a police training exercise. The area was chosen because it was near where Shannan Gilbert vanished. Three more bodies were found in the thick brush along the remote highway by police on Monday.
Police said some of the bodies were found wrapped in burlap sacks were about 500 yards apart and appear to have been thrown from a car, possibly as far back as two years ago.
"They weren't buried, and were in different stages of decomposition. Obviously some were there for some time," Dormer said.
"Common sense tells us it's not a coincidence," Suffolk County Det. Lt. Gerard Pelkofsky told ABC News New York Affiliate WABC.
If it does prove to be the work of a serial killer, it wouldn't be Long Island's first.
In 1993, Joel Rifkin was convicted of murdering 17 women. In 1987, Richard Angelo, nicknamed the "angel of death," murdered 25 patients.