Parshuram Madiyappa Kalkanthi (30), was reportedly depressed over some superstitious beliefs following which he poisoned his wife Jamuna (25) and children - Payal (7), Manisha (5) and Karan (3). He later set himself ablaze at their house in Lokmanya Nagar in Kothrud area of Pune, police said.
"We are investigating the case...Since nobody from the family is alive, it is difficult to ascertain the exact reason behind the incident," a police official said.
The bodies have been sent for postmortem, police added.