Rhode Island investigators announced breakthroughs in two cold case investigations on Wednesday, identifying the suspected killers of two women in 1984 and 2007.

The killings of 24-year-old Debra Stone in 1984 and 49-year-old Cynthia McKenna in 2007 were reexamined by Attorney General Peter F. Neronha’s Cold Case Unit, which launched in 2023.

Debra Stone

Stone’s body was found floating in the water in Narrow River in Narragansett on Sept. 2, 1984, officials said at a news conference Wednesday. She was wrapped in a sleeping bag and anchored with a cinder block. The Office of the Chief Medical Examiner determined she was strangled.

Investigators believe she died on Aug. 29, 1984 — the last time she was heard from. During the initial investigation, an informant named the killer as Rober

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