Alma Avraham, 84, was filmed during her abduction and captivity by Hamas. Released after over seven weeks, she faced severe medical neglect.
Alkadi testified that he witnessed Zalmanovich's death in captivity in December 2023.
Controversy surrounds the October 7 state memorial in Ofakim, with many victim families and kibbutzim rejecting government involvement.
The bodies of hostages Nadav Popplewell, Yagev Buchshtab, Yoram Metzger, Haim Peri, Alexander Dancyg and Avraham Munder were recovered from Gaza.
"With profound sorrow, Kibbutz Nir Oz announces the murder of Avraham Munder while held hostage in Gaza, after enduring months of physical and mental torture," the Kibbutz's statement read.
The families of hostages urged negotiators directly to finalize a deal, highlighting broad public support in Israel and bypassing government involvement.
Hamas previously published a video in mid-November that showed Zalmanovich in critical condition, and his death was declared in December.