Apoorva Shukla Tiwari, the wife of Rohit Shekhar Tiwari, has confessed to killing her husband, the Delhi Police said on Wednesday.

Earlier today, the Crime Branch arrested Apoorva from the Tiwari’s residence in South Delhi. Rohit Shekhar Tiwari was the son of late UP and Uttarakhand CM ND Tiwari.

“Investigation has proved it beyond doubt that it is her (Apoorva, Rohit’s wife) work and she has confessed to it. Till now no evidence has been found regarding someone else’s involvement,” Rajiv Ranjan, Delhi Additional CP (Crime), told reporters at a press conference on Wednesday.

“We have arrested Apoorva with the help of scientific evidence and FSL report. She confessed that she has murdered her husband and cited unhappy marriage as the reason,” Ranjan was quoted as saying by IANS.

According to reports, Apoorva had a heated argument with her husband on the night of 15-16 April over Rohit meeting a woman friend.

Apoorva, who is a Supreme Court lawyer, then entered her husband’s room and killed him. The entire incident unfolded in just 90 minutes.

The police said that she also destroyed evidences and initially tried to mislead the Crime Branch team.

The Delhi Crime Branch had questioned Apoorva on 21 April, five days after her husband’s death.

A resident of South Delhi’s Defence Colony, Rohit died on 16 April. His mother, who was admitted to Max Hospital in Saket in South Delhi, had received a call from home about her son being “unwell and bleeding from the nose”.

An ambulance had subsequently brought Rohit to the same hospital where he was declared brought dead.

A murder case was registered by the police after an autopsy report last week stated that the 40-year-old died of “asphyxia”, indicating that he was strangulated and smothered.

The autopsy on Rohit’s body was conducted by a medical board comprising five senior doctors of the All India Institute of Medical Sciences (AIIMS).

“The medical board unanimously concluded that the cause of death in this case is asphyxia as a result of strangulation and smothering. It is a sudden unnatural death, placed in the category of homicide,” the head of the AIIMS’ forensic department, Dr Sudhir Gupta, said.

Police said that medical reports revealed that Rohit was drunk on the night of the incident.

Crime Branch officials along with a forensics team of Delhi Police visited Rohit’s house last week and questioned his family members and domestic helps.

Rohit Shekhar had fought a six-year-long battle in courts to prove that he was ND Tiwari’s son. The veteran Congress leader, who died at the age of 93 last year, had initially refused to give his blood sample for a DNA test in this regard.

In 2014, the Delhi High Court declared ND Tiwari as Rohit Shekhar’s biological father. The Congress veteran later accepted him as his son.