The Karnataka government has replaced the head of the SIT probing the alleged rape and murder of 17-year-old Sowjanya near Dharmasthala in 2012. IGP Chethan Singh Rathod takes over as SIT chief from N Shashi Kumar following integrity concerns in the 2012 rape and murder case. Belthangady: Senior IPS officer Chetan Singh Rathore has been appointed as the new head of the Special Investigation Team (SIT) reinvestigating the Sowjanya rape and murder.