On a bitterly cold January morning in 1998, 23-year-old Renee Sweeney was stabbed to death. Along with the heartache, the killer left behind a glove, a light-weight blue jacket, and his DNA. After following up on thousands of tips, last year Sudbury police released a sketch based on the DNA sample, garnering more leads. Sweeney's sister Kim his holding out hope a tip will finally lead to her sister's killer.