The 55-year-old nun who was found dead inside the well of a convent in Kollam district of Kerala died due to drowning, the post-mortem report stated.
There were no other injury marks on the body of Sister Susan, an inmate of Mount Tabor Dayara Convent at Pathanapuram, except the "self-inflicted" injuries on the wrists, police said, quoting the report.
The post-mortem of the nun, belonging to the Malankara Syrian Orthodox church, was carried out at the government medical college hospital in Thiruvananthapuram.
A senior police officer told that based on the post-mortem report, it was assumed to be a case of suicide.
"According to the post-mortem report, the nun died due to drowning. It also indicated the presence of naphthalene balls in her abdomen. Both the wrists were cut, but no other injury marks on her body," he said.
Police would soon submit a report based on the post-mortem report, the officer added.
The body of Sister Susan, a teacher at St Stephens School attached to the convent, was found floating in the well at the sprawling compound on Sunday morning.
Other inmates of the convent had first came across blood stains near the well and then found her body inside it.
Blood stains were also found inside her room.