The CBI arrested Gujarat deputy SP Tarun Barot in the Sadiq Jamal fake encounter case on Tuesday.
Barot - an accused in the Ishrat Jahan encounter case - is the first policemen to be arrested for Jamal's killing. In July, the CBI had arrested a Mumbai-based scribe, Ketan Tirodkar.
Jamal - who was killed in a staged shootout in January 2003 - was the domestic help of a Dubai-based Indian businessman, who allegedly had connections with the underworld. But after a petty fight, the businessmen allegedly got Jamal deported to Mumbai, where he ended up in police custody.
It was Mumbai's encounter specialist Daya Nayak, who had kept Jamal in illegal detention. Barot, then an inspector with the Ahmedabad crime branch, accepted Jamal's custody from Nayak.
After bringing him to Ahmedabad, a crime branch team including Barot allegedly shot him dead.
The crime branch, headed by DCP DG Vanjara, claimed Jamal was a LeT-trained terrorist, who had been tasked with the assassination of Gujarat CM Narendra Modi.
In 2008, Jamal's brother Shabir moved a petition in Gujarat high court and sought a CBI probe into the murder.