NEW DELHI: A day after Rohit Shekhar Tiwari's autopsy report suggested he died an unnatural death, his mother said he did not share a cordial relationship with his wife and was apparently upset over his political career not taking off. She also said Shekhar had recently visited the place where his father, former chief minister ND Tiwari, was cremated.

The Delhi Police on Thursday registered a case under Section 302 (murder) of the IPC into Shekhar's death following the findings in his autopsy report. The case has been transferred to the crime branch for investigation.

"It is shocking to learn that my son was murdered. What do I say? Let the mourning end. Why was Rohit not woken up when he was sleeping till 4 pm (on Tuesday)?" his mother Ujjwala told PTI.

She said Shekhar (40) and his wife did not share a cordial relationship and "they had issues since day one of their marriage".

Born out of wedlock, Rohit fought a six-year-long paternity battle with his late father, after he refused to accept him as his biological son. On April 24, 2014, the Delhi High Court, declared Rohit Tiwari's biological son. While passing the order, the court took into note the report of Tiwari's DNA test, which proved that Rohit was indeed his son.

Tiwari later married Ujjwala in Lucknow. He died at the age of 93 on October 18, his birthday, last year.

Shekhar and his mother went to Haldwani to cast their vote on April 11. They were supposed to return to Delhi on April 12, but changed their plan after Shekhar said he "wanted to meet his people".

"Shekhar said he wanted to meet his own people and visit the place where his father was cremated -- Chitrashila Ghat (in Ranibagh). We stayed in a small resort in Ranibagh. After visiting the ghat, we went to Neem Karoli baba to seek blessings," she recalled.

"He said to me, 'Why's my (political) career not taking off? Even those who don't have experience and are not capable enough are getting tickets. I will seek blessings of the baba so that I can take my father's political legacy forward'," she said.

On April 15, the mother-son duo returned to Delhi. While Shekhar went to his residence in Defence Colony, Ujjwala went to Tilak Lane and returned later.

"When I came back, I asked Apoorva (Shekhar's wife) about him, she told me 'he was tired, so he had dinner and went to sleep'. Meanwhile, Shekhar came down and said he was exhausted," she said.

She also recalled telling him that he should take rest as he recently underwent a bypass surgery.

"Some media reports said he was drunk, but he did not look like he was intoxicated," his mother said.

Ujjwala said she left for Tilak Lane at around 11.30 pm that day and returned around 2 pm the next day but could not meet her son.

"I had severe pain in my thumb, so I immediately took an appointment at Max Hospital. Before leaving, I asked Apoorva about Shekhar. She told me he was sleeping and I thought I shouldn't disturb him," she said.

Ujjwala said she reached Max Hospital around 4.30 pm and went to the emergency ward.

"Rajeev ji (who was accompanying her to the hospital) received a call from a domestic help who said Shekhar was smeared in blood and asked us to come with an ambulance. My car was parked near an ambulance. I ensured that an ambulance left for my home immediately," she recalled.

Ujjwala said that while on her way home, she dialled Dr Sumit Sethi, who had been treating Shekhar since 2007 when he first suffered a heart attack.

"My son was under some stress but I don't want to talk about it. By the time I reached home, Apoorva had made him lie down in someone's car. When I saw his condition, I had little hope left about his survival," she said.

"I trusted Apoorva and did not question her as to why was Shekhar sleeping till so late," she said.

"Apoorva and Shekhar tied the nuptial knot in 2018. It was a love marriage. Before that, they were seeing each other for a year," Ujjwala said.

"They even took a break in between. Shekhar maintained distance from her and said he did not want to marry her. After elections in March 2017, we took a flight and came to Delhi," she said.

"They were not in touch from January to March, 2018. But on April 2, 2018, they came to me and expressed their wish to get married," she said.

(With inputs from PTI)