Jessica and Neil Fonseca had been visiting a psychiatrist for the past few years, police have learnt.

According to police sources, the couple had attended several joint sessions with the psychiatrist but lately Neil used to go to the doctor alone.

The last visit was late last year and Neil was depressed then, said a source.

"They used to visit me but I cannot reveal any detail," the psychiatrist told Metro on Monday.

Jessica, 43, and the couple's twin sons Joshua and Darren, 16, were found murdered with their skulls smashed and throats slit in their rented Palm Avenue flat on Saturday morning. Neil, 49, had a gash on his throat and wounds on his hands. He is undergoing treatment. The four had been sharing a bedroom after returning past midnight from a club in Ballygunge.

The post-mortem report that reached the hands of investigators on Monday confirmed that Jessica and the boys died early on Saturday. "The report states the deaths were caused by hits with heavy blunt objects and injuries on their throats. The twins especially were hit hard on the head," said Debasish Boral, joint commissioner, crime.

Doctors at the nursing home where Neil underwent a surgery for the injury on his windpipe said he was recovering well.

He had soup on Monday, said a doctor. "It would take seven to eight days for him to start talking again," said one of the doctors.

The police had said on Sunday that Neil, an interior decorator, would be charged with the murder of his wife and sons once he is fit.

Replying to questions written to him by investigators, Neil allegedly claimed that Jessica had killed their sons before she died after her head banged against the post during a scuffle with him. Neil also told the cops that he had attempted suicide by slitting his throat.

Investigations indicate that he had killed his wife and sons in cold blood, using kitchen knives and a recently purchased 25-pound dumb-bell.

According to the cops, Neil, an interior decorator, had been struggling financially for three years and the couple had fought over this in the past.

Asked why Neil was not being arrested, an officer said: "We arrest someone when we need to interrogate him or her. In this case, the suspect is not in a position to speak because of the wounds in his throat. What will we do after taking him in our custody?"

The police have collected the statements of Neil's sister-in-law Shabana Anwar and his daughter Samantha, a student in Pennsylvania who was home on vacation. Shabana, Samantha and Neil's mother Shirley were in other rooms of the four-bedroom apartment on Friday night.

"The funeral is tomorrow. We will speak with family members and friends after the funeral," an officer said.