The Delhi Police are still hard at work to crack the mystery of 20-year-old Shobhit Modi's murder.
The second-year engineering student was stabbed multiple times, leading to his death outside a colony gate in south Delhi's Vasant Kunj on Thursday.
Sources said police are questioning a male friend of Shobhit's girlfriend, who has recently appeared for her Class 12 exams from a prominent south Delhi school.
"On the basis of the questioning of one of his close friends, we have detained a young male suspect who was earlier romantically involved with Shobhit's girlfriend. He had a confrontation with Shobhit three days prior to the incident," said a senior police officer investigating the incident.
The police's theory, that someone from Shobhit's huge circle of friends was involved in his murder, was reinforced on Monday when investigators stumbled upon the fact that the call records on his iPhone had been deleted.
This, in turn, has led investigators to believe that Shobhit was either called to the spot, where he was attacked by someone known to him or his assailants were professional assassins hired by someone.
"Only Shobhit knew the password to his phone and it was very difficult for us to unlock it despite asking several of his close friends and family members for assistance. Finally, it was his girlfriend who unlocked the phone for us. Shobhit had shared his password with her. Either he was forced to delete the call records by his assailants or they knew his password before they attacked him," the officer said.
It has also emerged that Shobhit was stabbed several times not in his stomach, but his heart and back, leading the police to believe that professional killers with a clear intent of murder were involved. The police are now almost sure that it was not a case of road rage.
"Shobhit was stabbed once in the heart and once very close to it. The subsequent blows were inflicted on his back by a round, sharp object such as a screwdriver or an icepick," said the officer.
Meanwhile, the Delhi Police have roped in its specialised Crime Branch to assist other teams with the investigation and provide them a more technical perspective.
The teams formed are understood to have put all phones active in the Vasant Kunj area at the time of Shobhit's murder, under technical surveillance.