Gopalaswamy Mahendraraja was related to Velupillai Prabhakaran, former leader. Mahattaya joined the in 1978. Mahattaya is the person who was leading to most of the attacks done by when Prabakaran was in India until 1986.
Mahattaya was sent to Jaffna by Prabakaran to inquire the conflict matters arose between and University of Jaffna in 1986 as a uni student Vijetharan was kidnapped and killed by Kittu group.
Prabakaran returned to Jaffna at the end of 1986. Mahattaya was second in command at one time in the Velupillai Prabhakaran and Pottu Amman found out that he was leaking information to India"s RAW. Mahattaya group was famous for doing all well planned attacks.
Prabakaran wanted to eliminate him. He was relieved of both posts in 1992.
In 1993, the took him into custody.
He was executed on December 28, 1994 by the.
In 1987 he became the deputy leader of the, and in 1989 he became the head of the short-lived People"s Front of Liberation Tigers, a political party founded by the.