The actor, who was born in Kodaganuru near Davangere, is popularly known as Junior Rajkumar. He started his career pursuing acting in drama companies like Gubbi company, KBR company, Kumareshwara Nataka Sangha, Shree Shaila Mallikarjuna Natya Sangha and Karnataka Kala Vaibhava Sangha. Popular plays like Policena Magalu, Nayakanahati Thipperudreswamy Mahatme, Madakari Nayaka, Mudukana Maduve, Tippu Sultan and Gomukha Vyaagra shot him to fame. He has acted with actors like Musuri Krishnamurthy, Sundar Krishna Urs, Obaleswhar, Sudhir and Umashree.
In Sandalwood, he has acted in over 50 films. Some of his notable films are Sangliyana 3, Janumada Jodi, kitty, Jackie, Raja, Thaayi, Shabari and Keladi Chenamma, among others. He has even acted in Kannada serials like Pa Pa Paandu, Sankranthi and Mahamayee. Jayakumar has also won various awards like Suvarna Academy Award, Rajyotsava and Aryabhatta awards.
Actor Mandya Ramesh mourned the death of Jayakumar by recalling his association with the late actor, which started with the movie Janumada Jodi. Mandya Ramesh said that the death of Jayakumar is a personal loss to him.