NIA officer Tanzil Ahmad, who was shot dead by unidentified assailants post-midnight on Saturday, was buried with full state honours on Sunday.
His body was on Sunday brought to his home in Delhi and his last rites were performed in Shaheen Bagh area of south Delhi.
National Investigation Agency (NIA) spokesperson Sanjeev Kumar, who was present during the burial to pay his last respects to the officer, called him a "martyr".
"He is a martyr," Kumar said while referring to Ahmad.
He said the officer's kin will get all dues that are given to the families of officers killed while in service.
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Ahmad, 48, known for undercover operations, joined the NIA in 2010. He was an assistant commandant with the BSF but was on deputation with the NIA as an inspector.
Ahmad was shot 21 times near Sahaspur village in Uttar Pradesh's Bijnor district when he, along with his wife and two children, was returning from a wedding. His wife Farzana received four bullet injuries, but his children were unharmed.
His wife is undergoing treatment at the Fortis Hospital in Noida.