A Health Ministry card that belonged to the missing paramedic provided a rare solid identity clue.
Two other mass graves were found near the lake last month -- one containing 40 bodies and another with 29. Twenty-five other bodies, some decapitated, were found in October, and authorities said the victims apparently died within the previous three months.
Authorities have also found mass graves in other parts of the country where violence has decreased. Seventeen corpses were unearthed last month at a site near Baqubah.
The areas where the bodies were found are both former al-Qaeda strongholds, suggesting the terror network was behind the killings.