One Rashtriya Swayamsevak Sangh (RSS) worker was murdered in Thiruvananthapuram's Sreekaryam on Saturday.
The Bharatiya Janata Party (BJP) has alleged Communist Party of India (Marxist) CPI (M) workers behind it.
The Police have started the investigation.
Further details are awaited.
On July 11, an RSS office at Payyannur in Kannur was attacked allegedly by CPI (M) workers.
No one was inside the office at the time of the incident.