DNA evidence linked Richard Cottingham to the killing of Diane Cusick, prompting Nassau County prosecutors to review 13 years of unsolved murders of women.
Genetic genealogy was used to identify skeletal remains as those of a 15-year-old girl who went missing in Florida in 1972. The authorities believe she was the victim of an ex-police officer convicted in 1973 of two murders.
Advances in DNA technology helped the authorities to identify remains found near a highway in 1992 as those of Margaret Ann Sniegowski Jr., who had disappeared from her home in Ohio.
The authorities said they connected Harry Edward Greenwell, who died in 2013, to at least three murders in Kentucky and Indiana, using genetic genealogy.
The authorities in Virginia say that Anthony Robinson met his victims via online dating sites and later transported their bodies in shopping carts to dispose of them.