Thabo Maroalela was admitted to the Carletonville Hospital and placed on the third floor on September 4 after his family said "he was so sick that he could neither talk, eat by himself nor walk."
On the night of September 7 the hospital told the family that Maroalela had gone missing but was later found on September 9.
He had reportedly fallen to his death from ward 6 on the third floor.
Khutsong residents, angered by the death of Maroalela and that of another patient at the hospital, marched to the institution where they clashed with police.
So the SACP mobilised disgruntled residents to protest against "poor service delivery, lack of accountability, negligence and a shortage of medications at the hospital", SACP Carletonville secretary Pearl Khawyile said.
"Considering his condition, we were surprised when they said it must have been suicide," Maroalela's sister Grace Phiri said.
Maroalela's twin brother, Thabo, said: "A nurse known as Mabuza called to inform us of the situation and then dropped the phone on me when I tried asking questions.
"We have received no other communication from the hospital.".
The other patient, Thabang Mosia, was also found on September 7 after reportedly falling out of a window.
"An epileptic child, known only as Qondeni was allegedly neglected by the hospital and that resulted in his being permanently disabled," Khawyile said when she presented a memorandum to the hospital chief executive officer Mokou Motloung.