The 82-year-old woman was walking her dog in the alley behind her Minneapolis home in November 1996 when a stranger raped and beat her. She died 12 years later, her assailant never having been caught.
Then, in 2011, DNA tests yielded a hit. A suspect, Kevin Quinton Haynes, was arrested last summer and now awaits trial. The woman's case is one of hundreds that Minneapolis police and Hennepin County investigators and prosecutors — armed with scientific advances that now allow the most minute traces of evidence to be tested — are pursuing with new vigor.
It's paying off: To date, investigators believe they have solved two murders and uncovered three serial rapists as the extraordinary detective work unfolds. They have obtained 33 convictions, mostly in rape cases, and over the next year prosecutors hope to file charges in another 20 cases.
Some of the previously unsolved and languishing cases date back decades.
"A lot of these victims think we've forgotten about them, but we don't forget," said Minneapolis Police Lt. Mike Martin, who heads the sex crimes unit.
The work began in 2009, after the county received a $500,000 Department of Justice grant that allowed authorities to sift through thousands of old rape and murder case files looking for evidence they could submit for DNA testing.
Searching old evidence boxes, they found and then tested nearly 600 biological samples connected to unsolved cases, including hair, skin cells, blood and semen.
Forensic scientists obtained DNA profiles of 420 possible suspects from those samples, loaded them into the national DNA criminal database, and stepped back so investigators and prosecutors could methodically piece things together.