ISLAMABAD, Feb 26: The man who last week confessed to murdering an 11-year-old girl, after raping her, has confessed to murdering the daughter of a senior police officer the same way in November that the family did not report to police.

Police say that the man's girlfriend, whose interrogation had led to his arrest, knew about his earlier crime too. She is a common link to the two crimes as she was tutor to the little girl and a classmate of the man's earlier victim in a private university of Islamabad.

A police officer described to Dawn the man, a landlord from Lala Musa in his late 20s, as a habitual rapist and his girlfriend as one who procured unsuspecting girls for him in return for sexual and other favours.

They might have killed more of their preys than the two they confessed to but not reported to police like the murder of the senior police officer's daughter.

After the alleged rapist's confession to that November 2012 the police registered a murder case and arrested his girlfriend in that case, while his boyfriend had been arrested on the basis of clues gleaned by the police by questioning her on their latest 11-year-old victim.

Police said the little girl was visiting her for tuition when she went missing until her charred body was found on February 13.

A bail-before-arrest plea that the teacher-girlfriend had filed in the district and sessions court on February 16, after police came for questioning her, came up for hearing on Tuesday and was set for arguments on February 28.

Sources close to the investigation said that the suspect (the alleged killer's girlfriend) was visiting the daughter of the police officer, her university classmate, on November 4, 2012, for combined studies in a room with a door to go out of the house.

The next morning the suspect informed the officer's wife that during the night her daughter complained of headache, had coffee and went to sleep, tightly wrapping her dopatta around her neck and was still sleeping.

When her family's effort to wake her up failed, she was taken to Pims where doctors pronounced her dead. The medical report of the deceased suggested there were marks of strangulation on her neck.

However, the suspect convinced the family that the marks were those of the tightly wrapped dopatta. Her father, who was away performing Haj in Saudi Arabia, returned post-haste and she was buried without postmortem.

According to the sources, the grieving officer told his inquiring seniors that his daughter died of cardiac arrest and that he suspected no foul play.

But the man confessing to murdering her apparently uncovered the mystery while being interrogated about the gruesome killing of the 11-year-old girl. It is said the interrogators bluffed him into making that confession by saying his girlfriend had already said so.

The man is claimed to have told the police investigators that he had been pursuing the poor girl and used his girlfriend to intoxicate her classmate, satisfied his lust and then strangulated her.

Both, the man and his girlfriend, have now been booked for murder.