Both were arrested here on Sunday night. Officer Manoj Kumar Srivastava was found dead in his car near Dalibagh Sugarcane Institute in Hazratganj on March 21.

The names of Jageshwar Srivastava and his wife Aruna Srivastava surfaced, with Manoj's wife accusing them of their involvement in her husband's death.

Deputy Commissioner of Police (North) Abhijeet R. Shankar said that although Arun confessed that she was with Manoj the night he died, she maintained her innocence.

The deceased's wife, Sushma Srivastava of Gayatripuram, Gudamba, said that Aruna and Jageshwar killed Manoj by poisoning him.

Meanwhile, the autopsy report could not reveal the cause of death and Manoj's viscera was preserved for forensic examination.

Sushma alleged that Manoj knew Aruna and Jageshwar well. "A month before his death, Manoj had told me and my son Harsh that he was unhappy with Aruna and Jageshwar," Sushma said in her complaint.

According to the complaint given to the police, Manoj reached NBRI for some work and left his office at around 2.30 pm. But Manoj did not reach his home even till late night, after which Sushma lodged his missing report on the morning of 21 March. The same day around 11 am, Manoj was found dead in his car. During examination of the CCTV footage, a woman, later identified as Aruna, was seen coming out of Manoj's car and then boarding a rickshaw. The couple is being interrogated and more information is awaited.