High Quality Content by WIKIPEDIA articles! "Blood Ties" is the 21st episode of the sixth season of Diagnosis: Murder (1993 2001), an American medical/crime-drama, mystery television series; the episode originally aired on May 6, 1999. It was filmed as a pilot episode for a spin-off series that would have starred Kathy Evison and Zoe McLellan. The series, which would have been called Whistlers, was ultimately not picked up by CBS, the broadcast television network airing the series.