Ahangama Withanage Oswin Nandimithra Abeyagoonasekera was a member of Parliament and chairman and the leader of the Sri Lanka Mahajana Pakshaya or Party. He was assassinated by a female suicide bomber of the Liberation Tigers of Tamil Eelam (LTTE) while attending an election rally in support of Gamini Dissanayake, for the presidential election of 1994. The October 24, 1994 suicide bombing that killed Ossie Abeyagoonasekera and 57 others was one of the highest-casualty suicide attacks using a jacket bomb by a single individual in Sri Lankan history. He was an alumnus of Ananda College, St. Benedict's College, Colombo.