Karen Lynn Zendrosky was 16 when she was last seen the evening of October 23, 1979, at the Whitehorse Bowling Alley in Bordentown Township, New Jersey. She was described as 5 feet 2 inches to 5 feet 3 inches tall, about 97 pounds, with brown hair, green eyes, a scar on her right ear from a plastic shield, and a previously broken lower right arm. She was wearing overalls and a brown and yellow zip-up sweatshirt that night.

From the start investigators treated her disappearance as a homicide. Rumors circulated that she had gone to a nearby lagoon, known as a party spot, with two or three men in their early twenties; it is not known whether she went willingly. About seven years after she vanished, tips suggested she had been killed in woods near the lagoon and her body disposed of in a sludge pit at a Hamilton wastewater treatment plant. Several local men were named in those rumors and were questioned over the years.

In 2005 ground-penetrating radar indicated areas consistent with organic matter in the sludge pit, prompting a three-day excavation, but no remains were found. The New Jersey State Police say they will prosecute if sufficient evidence is located. Does anyone who knew Karen or was in Bordentown or Hamilton that night have information that could help the investigation?