Muhammad Saifuddin, who was known by various aliases, including Abu Walid, was killed by shrapnel from a tank shell in late January in eastern Deir ez-Zor province, national police spokesman Dedi Prasetyo said in a text message.
Prasetyo described him as a Daesh “executioner and soldier”.
Muinudinillah Basri, Saifuddin’s brother, said by telephone he had learned of his brother’s death after receiving a photo of his body.
He had not seen his brother since he left for Syria with his wife and children, he said, Reuters reported.
Sofyan Tsauri, a former Indonesian militant, said Saifuddin was “an important figure” in Daesh who represented its Southeast Asian contingent and had been close to the group’s leader Abu Bakr al-Baghdadi.