Gaikwad, who was arrested on September 16 in connection with the murder of Pansare, is in judicial custody till December 18.
The 392-page charge sheet, filed by police before judicial magistrate R D Dange, mentions a list of 77 witnesses.
Pansare, a veteran CPI leader, and his wife were shot by two unidentified motorcycle-borne persons in Kolhapur in February this year. While his wife survived, Pansare later died in a Mumbai hospital.
He was one of the leaders who spearheaded the anti-toll movement in Kolhapur district of western Maharashtra.
Meanwhile, veteran Leftist leader ND Patil and Pansare’s daughter-in-law Medha Pansare today met Kolhapur’s new DSP Pradeep Deshpande in connection with the case.