The producer of TV2's Sensing Murder programme says he had no idea reruns of the six-year-old shows were to be broadcast, and if he had, he would have informed the families.
Some of the families, including murder victim Jane Furlong's mother, Judith, have expressed shock and upset at the programmes suddenly appearing on television this month.
Sensing Murder follows Kiwi psychics Sue Nicholson, Kelvin Cruickshank and Australian medium Deb Webber, as they investigate high-profile unsolved cases.
The show involves two psychics being given a photo of the victim on separate days. They then use the photo and their psychic abilities to retrace the victim's steps.
The show's producer, David Baldock, told the Herald he was "equally concerned and sad that neither the families nor myself as the producer were notified that the series was going to be rerun".