A former radio jockey named Rajesh was hacked to death by unidentified assailants at his studio in Trivandrum’s Madavoor late last night. The 36-year-old Rajesh and his friend Kuttan had returned from a stage programme and were unloading the equipment in the studio when a group of unidentified assailants came in a car and attacked them with sharp weapons. His friend also got injured during the altercation and is undergoing treatment. A police investigation is underway to nab the culprits.