Ranjan Wijeratne was born on 4 April 1931, the son of Walpola Mudalige George Hercules Wijeratne and Rosalind Maria née Senanayake a first cousin of D. S. Senanayake. He was educated at S. Thomas' College, Gurutalawa and S. Thomas' College, Mount Lavinia.
Plantation career
Wijeratne began his career as a planter having apprenticed under Harris De Chretzer at the Kehelwattha Plantation in Badulla and then joined the Vitols Plantation on 11 October 1950. He went on hold senior positions in the tea plantation sector including being appointed General Manager of Demodara Group in 1968, the largest tea plantation in Ceylon. He served as a Director of Whittals Estates and Agencies, Gordon Frazer and Co, Ltd., Bosanquet and Skrine. He was the Chairman of Planters Society from 1967 to 1968 and the Chairman of Planters Association of Ceylon from 1970 to 1971. He was also Chairman of the Agency section of the Planters Association, Chairman of the Colombo Tea Traders’ Association, Vice President of the Ceylon Institute of Planting, Member of the Ceylon Tea Propaganda Board, and Member of the Tea Research Institute of Ceylon.
Wijeratne resigned from all government posts and his commission when he went into active politics in 1988 when he was appointed Chairman of the United National Party. He later went on to become the General Secretary of the Party. Wijeratne led the party in 1988 Presidential elections followed by the 1989 General Elections. Wijeratne was appointed a National Listmember of parliament in 1989 and was appointed as Minister of Foreign Affairs and State Minister of Defence by President Ranasinghe Premadasa. Wijeratne invariably made many enemies due to his tough position. He was equally hawkish in dealing with Liberation Tigers of Tamil Eelam and Janatha Vimukthi Peramuna militants. Having established Operation Combine, he masterminded the JVP near rout in 1989 and the LTTE was to follow.
Death
He was assassinated on 2 March 1991, by the LTTE organisation using a remote controlled car bomb while he was travelling to his office in Colombo on Havelock Road, during rush hour killing 19 people including the minister and five bodyguards and 13 civilian bystanders. Ironically, two days before his assassination Wijeratne laughed off the LTTE threats to his life saying "Good Luck to them". He was known to have a hard line stance towards the LTTE. Wijeratne was posthumously promoted to the rank of General of the Volunteer Force of the Army and Kotelawala Defence Academy at its second convocation, conferred an honorary degree of Doctor of Law .