[3][failed verification] During the Japanese occupation of the Dutch East Indies, he became the head of the Tjahaja newspaper.

[3][4][5] Based on witness information, Oto is believed to have been murdered on a beach in Mauk District, Tangerang Regency in Banten (formerly West Java).

The prosecutor who located the policeman asked to investigate further to determine the larger political objectives and members of the "Black Troop", but this request was not heeded, so the true circumstances of his murder remain unclear.

His body was replaced by sand and water taken from the beach and interred in a cemetery in Lembang, now of West Bandung Regency.

He was designated as a National Hero of Indonesia on 6 November 1973, thus legally declaring him dead, as the title is awarded posthumously.