In Dec, a chargesheet has accused Headley, his Pakistani Canadian accomplice Tahawwur Rana, Lashkar-e-Toiba (LeT) founder Hafiz Saeed and seven others in the Mumbai terror attack.
Now, the NIA can move for the extradition of Headley to stand trial in India. Currently, he is lodged in US jail.
A metropolitan magistrate's court had issued the letters rogatory to a US court as the Mumbai city police was waiting for the access to David Headley and his alleged accomplice Tahawwur Rana for their involvement in the 26/11 Mumbai terror attacks.
Two years back, the NIA team had interrogated David Headley, where he had revealed the details of his visit to India.
Pakistani-Canadian Tahawwur Hussain Rana was convicted for helping Headley to use his business for plotting the attack.