Brief footage from the upcoming segment, previewed online Thursday, showed Danis joining Clancy for the interview. The segment is scheduled to air Sunday.
The interview will address the 2023 murders that left Clancy childless. His ex-wife, Lindsay Clancy, strangled their three children — 5-year-old Cora, 3-year-old Dawson and 8-month-old Callan — in the family's Duxbury home.
The appearance marks Clancy's first public interview since the killings. Danis is a fertility doctor in New York City.