What was the J Dey case in which Chhota Rajan got life term?

In June 2011, crime journalist J Dey was shot dead by bike-borne assailants in Mumbai's Powai. A month later, gangster Chhota Rajan reportedly called a news channel and confessed to the crime, claiming Dey was writing against him and working for rival Dawood Ibrahim. Rajan added he was instigated by journalist Jigna Vora due to her professional rivalry with Dey.