From 2015. The FBI got involved...
https://abc7ny.com/gilgo-beach-suffolk-county-murder-long-island-women-killed/1119065/
Two things strike me-
One- LE says he is NOT connected to the other 10 murders on the beach, (haven’t revealed how they know) and
Two- how likely is it that he murdered 4 women in a brief time period and then stopped, quit cold-turkey and hasn’t killed in the last 10 years?