Hindu Yuva Sene's Naveen was arrested and named as one of the accused in the case on March 9.
Earlier on March 5, five days SIT custody was granted to Naveen by the Bengaluru Magistrate Court in regards to the same.
Naveen was caught by the crime wing of the state police's central crime branch on February 18.
Gauri, the editor of the Gauri Lankesh Patrike - a tabloid known for "anti-establishment" views, was shot dead by unknown by assailants outside her residence in Bengaluru on September 5, last year.
Following her murder, several protests, across the country and especially in prominent parts of Karnataka, had taken place. (ANI)