MASSAPEQUA PARK, N.Y.—Investigators have been digging in the yard at the Long Island home of Rex Heuermann, who was charged earlier this month with killing at least three women and burying their remains on a remote stretch of beach highway. A yellow excavator that had been seen scooping dirt in the backyard Sunday was still…

RIVERHEAD, N.Y.—Authorities on Long Island are vowing to continue investigating a string of killings known as the Gilgo Beach murders after charging an architect in the deaths of three of the 11 victims. Rex Heuermann, 59, is accused of killing Melissa Barthelemy, Megan Waterman, and Amber Costello over a decade ago. He is also considered…

MASSAPEQUA PARK, N.Y.—The first find was startling: a woman’s skeletal remains cast into the dunes along a remote Long Island highway. Then came the shock. Days after that discovery in December 2010, police discovered parts of three more women nearby on a spit of sand known as Gilgo Beach. The remains of six other people…