After several months of growing steadily weaker and undergoing treatment from Dr Sim Ki Ay, on the evening of 17 November 1948 Oerip collapsed and died from a heart attack in his room in Yogyakarta.
Setelah beberapa bulan berada dalam kondisi lemah dan menjalani perawatan dari Dr. Sim Ki Ay, pada malam 17 November 1948 Oerip ambruk dan wafat di kamarnya di Yogyakarta akibat serangan jantung.