The father of a young woman killed in the Nova music festival massacre in Israel has died by suicide after struggling with grief. Vladislav Bongart took his own life in late February, leaving behind his wife and younger daughter. His daughter, Sofia, was among the 364 people killed during the attack on the festival, which was carried out by Hamas. Vladislav had visited his daughter's grave regularly and never spoke about his loss to colleagues. His wife said he refused help and felt heavy guilt for not being able to save his daughter.