However, police have not yet been able to unravel the motive behind the murders of his parents, sister and an aunt in the heart of the city.
The accused, who is being questioned by senior police officials, will be produced before a court tomorrow.
Police said the 30-year-old accused is suspected to be suffering from Schizophrenia.
The crime in the well educated family, came to light on Sunday morning after local people alerted police as smoke and fire broke out.
More From This Section
The three bodies were found charred beyond recognition.
The body of his aunt was found cut into pieces and packed in a sack.
Police said crime was committed on different days.
The MBBS dropout was arrested soon after he landed at the railway station here from Chennai on April 10.