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Unsolved slaying 10 years ago this week still mystifies Tiburon

The decade that has passed since Joan Rosenthal was killed has yielded no new information about the identity of her killer or what motivated someone to shoot the 75-year-old Tiburon widow on her patio in one of the safest neighborhoods in the country. Over the years, police say they’ve chased down every possible lead and studied each shred of evidence collected from the scene — but each time the trail has gone cold. However, leaps in DNA testing have kept hope alive that the perpetrator will someday be caught, said Tiburon Police Chief Michael Cronin.

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