The hostages, all men, have arrived back in Israel, where they will reunite with family and undergo medical checks.
Israel and Hamas have agreed to a pause in their two-year war and the release of the remaining hostages in exchange for Palestinian prisoners.
It’s been two years since thousands of Hamas-led militants poured into southern Israel after a surprise barrage of rockets.
Both the Biden and Trump administrations have tried to end the fighting and bring back the hostages.
As part of the agreement, Israel was supposed to release the prisoners last weekend after Hamas freed hostages from its Oct. 7, 2023, attack.
The incident raised new doubts about the future of the fragile ceasefire deal, which has paused over 15 months of war.
The remains were presumed to be of Shiri Bibas and her two children, Ariel and Kfir, as well as Oded Lifshitz, who was 83 when he was abducted.
The six to be released on Saturday are the last living hostages to be freed under the first phase of the ceasefire in Gaza.
Hamas confirmed Mohammad Shaheen’s death but described him as a military commander.
The sides have carried out five swaps since the ceasefire went into effect last month, freeing 21 hostages and over 730 prisoners.