A woman reporter with an English newspaper here was on Friday arrested for alleged involvement in journalist Jyotirmoy Dey's killing, police said.
Jigna Vora had allegedly provided Dey's mobile number and his location to mafia don Chhota Rajan, who claimed responsibility for the sensational June 11 killing.
Vora was arrested after being summoned by the Mumbai Police Crime Branch for investigation.
She will be produced before a special Maharashtra Control of Organised Crime Act (MCOCA) court.
Dey, 56, Mid Day's editor for special investigations, was gunned down near his residence in Mumbai.