A Students Federation of India (SFI) leader was hacked to death at Kiyare Junction at Bhrahmakulam, near Guruvayur, on Monday.
Unidentified persons came on a motorbike and hacked Fasil, 21, son of Kunnamkorath Salim of Brahmakulam, at 6.30 p.m.
Though Fasil was rushed to hospital, his life could not be saved.
He was area joint secretary of the DYFI at Thaikkat and SFI area joint secretary of Manalur. RSS activists are behind the murder, alleged the CPI(M).
A hartal has been called in the Manalur constituency on Tuesday.
Fasil, a Civil diploma holder, was working as supervisor in a construction company.
The police suspect that the murder was a sequel to an earlier political clash.