The murder of a pharmacist who was raped and strangled in her home in a South Dakota city more than half a century ago has been solved with the use of DNA technology and genealogy databases, police said. Investigators believe Eugene Carroll Field killed 60-year-old Gwen Miller in 1968 when he was a 25-year-old living in Rapid City, Detective Wayne Keefe said at a news conference Monday. It is "a little surreal" to finally identify the killer after 51 years and up to 5,000 hours of work, Keefe said.