JUSTICE for GILLIAN Sister, Senator Plan Rally For Parole Reform By LIBBY CUDMORE • Special to www.AllOTSEGO.com ONEONTA – When David Dart was sentenced for the murder of Gillian Gibbons, her sister Jennifer Kirkpatrick remembered a chilling message he gave her in the courtroom. “He looked right at me and said, ‘I’ll be back,’” she recounted. Now, 30 years after Gillian’s death, Jennifer is mounting a campaign to keep her convicted killer in prison. “My goal is to let the community…