Roy, as a DCP of Mumbai police then, had recorded the confessional statement of Javed Ali, an accused in the case.
Alleged SIMI member Saquib Nachan is the main accused in the case, along with 15 others.
A blast had occurred in Mulund on March 13, 2003, killing 12 persons and injuring 71.
On December 6, 2002, several persons were injured in a blast at McDonald's at Mumbai Central station while a person died when a bomb attached to a cycle had exploded in a market in Vile Parle on January 27, 2003.