Maheswaran joined the militant Liberation Tigers of Tamil Eelam (LTTE) in 1977.[5] The LTTE gave him the nom de guerre Mukundan.[5] He was chairman of the LTTE's central committee from 1977 to 1980.[3] He received military training in Lebanon and Syria.[6][7] Maheswaran and LTTE leader V. Prabhakaran were blamed for the shooting of MP M. Canagaratnam on 24 January 1978.[2][8] In 1982 A Sri Lankan court sentenced Maheswaran, in absentia, to 15 years rigorous imprisonment for the attempted murder.[9][10]
Maheswaran fell out with Prabhakaran and left the organisation in 1980.[11]
On the night of 19 May 1982, Maheswaran and fellow PLOTE members Jotheeswaran and Sivaneswaran (Nirnajan) were involved in a shootout with Prabhakaran and Raghavan (Sivakumar) of the LTTE at the Pondy bazaar in Thiyagarayanagar, Madras, India.[13][14][15] Jotheeswaran was injured and hospitalised but Maheswaran and Sivaneswaran escaped.[16] Maheswaran was arrested near Gummidipoondi railway station on 25 May 1982 after a shoot out with the police but was later released on bail.[17] Maheswaran and the PLOTE would continue to carry out bank robberies and kidnappings to finance their activities.[3]
Maheswaran's actions eventually led to divisions within the PLOTE, resulting in a number of defections and splinter groups to be formed, including the Eelam National Democratic Liberation Front (ENDLF). Maheswaran was known to deal with dissent very harshly, and is alleged to have carried out 38 murders.[3]
Maheswaran was involved in the failed 1988 Maldives Coup.[11] On 16 July 1989, Maheswaran was abducted by six men in Colombo.[18] His bullet ridden body was later found at Frankfurt Place, Bambalapitiya, near the Maldivian High Commission.[19] The ENDLF, an Indian-backed offshoot of PLOTE, claimed responsibility for the assassination,[20] however some sources blamed the assassination on dissenting members of the PLOTE itself.[21][22]
^Rajasingham, K. T. "Chapter 27: Horsewhip Amirthalingham". Sri Lanka: The Untold Story. Archived from the original on 22 June 2002.{{cite book}}: CS1 maint: unfit URL (link)
^Rajasingham, K. T. "Chapter 36: Indians rule the roost". Sri Lanka: The Untold Story. Archived from the original on 27 April 2002.{{cite book}}: CS1 maint: unfit URL (link)
^Rajasingham, K. T. "Chapter 39: Amirthalingham eliminated". Sri Lanka: The Untold Story. Archived from the original on 15 May 2002.{{cite book}}: CS1 maint: unfit URL (link)