In this Dec. 9, 2011, file photo, searchers, lower left, dig in a marsh area just east of Oak Beach, N.Y., for the remains of Shannan Gilbert, who went missing after meeting a client of a sexual encounter in May 2010. For years, Mari Gilbert insisted her daughter Shannon's death in a Long Island beach community was the work of a serial killer, perhaps the same one who left 10 other sets of human remains along a remote stretch of beach highway, just miles from where Gilbert's body was found. Now Mari Gilbert herself is dead, and authorities say another of her daughters is the one who violently stabbed the 52-year-old woman to death in upstate New York. (AP Photo/Kevin P. Coughlin, File)
