Filmmaker Barbara Sonneborn. In her debut documentary Regret to Inform, Sonneborn weaves together the stories of widows from both sides of the American-Vietnam War. Sonneborn is a war widow herself; her husband was killed in Vietnam in 1968. Regret to Inform will air on PBS later this month. IT has already received an Academy Award Nomination for Best Documentary feature, and won the Best Director and Best Cinematography documentary awards at last year’s Sundance Film Festival.