According to police, the builder cum RTI activist's body was found in decomposed status near Tamini Ghat area of the city.
Shirsath, a resident of Pune, went missing on January 30, following which, his family members filed a complaint.
The body has been sent for post mortem and a case has been registered under Indian Penal Code sections 302 (murder) and 201 (Causing disappearance of evidence).