The victim was allegedly sexually assaulted by an unknown person on July 12.
"The teenager had tried to end his life by consuming poison on July 20. He was battling for life at hospital since then and died today," a senior police official said.
The victim's father had lodged a complaint at Powai police station.
Based on the statement of the victim's father, police had registered a case against unknown person under the POCSO Act.
The accused is yet to be identified and further investigation into the matter is underway, the official said.