New Delhi: In less than 24 hours from the triple murder of a couple and their daughter in Kishangarh, Vasant Kunj, Delhi police claimed to have cracked the case. The killer turned out to be the 19-year-old son of the couple who reportedly revealed that he had decided on August 15 this year to “teach a lesson” to his family. Also Read - Delhi Riots: How Communal Clashes Were Engineered by 5 Key Conspirators, Police File Chargesheet; Name Tahir Hussain as Prime Accused

Suraj alias Sarnam Verma confessed to killing his parents and sister at their house saying he was fed up with being reprimanded by them for not focusing on studies and flying kites. Also Read - Journalist Spying Case: Chinese, Nepalese Nationals Caught Trying To Get Info On Defence Secrets, Says Delhi Police

According to the police, Suraj allegedly killed his father Mithilesh (44), mother Siya (38) and 15-year-old sister in the early hours and then ransacked the house to make it look like robbery. Also Read - Delhi Police's Special Cell Probing Cyber Attack on NIC, MEITY

Around 3 am on Wednesday, Suraj stabbed his father Mithilesh eight times. He then went to the other room where he stabbed his mother seven times and lastly stabbed his sister four times.

After crafting a story to tell the police, the accused ransacked the house and washed off his fingerprints from the knife and then alerted neighbours at around 5.30 am.

During the initial investigation, he told the police that two intruders had barged into their house and killed his family. When asked about why they left him alive, Suraj said that he escaped being killed as he played dead.

Suraj said the accused had come with an intention to commit robbery but no valuables were found missing, Devender Arya, Deputy Commissioner of Police (Southwest) said. He said they found it suspicious that the robbers spared Suraj.

The police ruled out the outsider theory as the main door was locked from inside. Meanwhile, the forensic team found that the “ransacked” bedrooms appeared staged and the electronic locker was not tampered with.

As many as six police teams then took turns to question Suraj who broke down after some time and confessed to killing his parents and sister.

The team from the Forensic Science Laboratory found that Suraj had washed his footprints from the bathroom and also the knife used to kill the family.

Suraj was holding a grudge against them since his parents raised an objection about his lifestyle and his disinterest in studies.

He had flunked his Class 12 exams and was scolded by them.

“He felt he failed his Boards since his father had asked him to supervise the construction of their house. He was upset about being blamed,” said another officer privy to the probe.

Police said his father had got him admission to a private institute in Gurgaon for a diploma in civil engineering so that he could become a contractor like him.

On August 15, he was scolded by his family for wasting time on kite-flying and then he decided he would do something.

He was upset with his sister since he felt his parents preferred her over him and she used to “leak details about his personal life” to their parents.

On Tuesday, he had gone with his friends to Mehrauli and while returning, bought a knife and a pair of scissors to execute the killings.

He behaved normally and even saw photo albums with his parents till midnight. He woke up at 3 am and stabbed his father multiple times. Awakened by the commotion, his mother who was sleeping in the same room raised an alarm but he stabbed her once, police said.

He then went to his sister’s room and stabbed her in the neck. His mother came there and tried to save her daughter but he stabbed her and even stabbed his sister in the stomach, they added.

He then ransacked the house and washed off his fingerprints from the knife and then alerted neighbours.

Police said a few years back, he had staged a fake kidnapping and fled the house but developed cold feet after he thought how he would sustain without money, police said.