The victim, who belonged to the Maratha community, was found murdered after being raped on July 13 at Kopardi village in Ahmednagar district.
The accused had inflicted injuries all over her body and broken her limbs before throttling her, the police said.
The incident turned out to be the trigger for the silent marches (mook morcha) by the Marathas across the state as the victim belonged to the community, while the culprits are Dalits.
Marches, joined by a large number of women, were taken out in the length and breadth of the state by the Maratha community demanding quick investigation and speedy trial in the case.
Marathas protest against the Kopardi rape and murder case in Sangli. File pic.