Headley has pleaded guilty in the 26/11 Mumbai terrorist attacks case.
Last year, a team of Indian officials had questioned Headley, a Pakistani-American Lashkar-e-Taiba operative, in Chicago. Headley has pleaded guilty to 12 terrorism charges, including his involvement in the November 2008 terrorist attacks in Mumbai that killed more than 160 people.
Headley was also the start witness to the just concluded trial of Pakistani-Canadian Tahawwur Husain Rana, who was on Thursday acquitted by a Chicago court in the Mumbai terrorist attack case. Rana faces a maximum sentence of 30 years in prison on the two counts combined and remains in federal custody without bond.
On Sunday, India expressed disappointment with the US court verdict acquitting Tahawwaur Hussain Rana of charges in the Mumbai terror attacks. External Affairs Minister S.M.Krishna said the judicial process in the US had taken a particular view with which India might not be very much satisfied, but linkages between the two persons facing trial and the Mumbai terror attack were fairly evident.