For over two decades, he functioned as a Magistrate and District Judge in different parts of the island and in October, 1962, he was appointed a Commissioner of Assize.

The LTTE called on him to refuse the reward, if he valued his life; however, Vaithialingam defied the outfit and accepted the honour.

In the citizens committee chaired by his good friend and former colleague on the bench, O. L. de Kretser, he worked on the Report of the Commission of Inquiry, on the Tragedy of January Tenth 1974 along with Bishop Sabapathy Kulendran of the Church of South India in Jaffna.

He said in Sinhala: “Go and learn Sinhala and come back.” A bystander told me what the board conveyed" - Justice Manicavasagar Vaithalingam 1974 Vaithialingam married Valamba, the eldest daughter of Nannithamby Selliah of Rosmead Place - son of Visva Udayar Sangarapillai Nannithamby, Broker of Mackwood & Co. & his wife Sellam, daughter of Kandarthamby Kandiah (Chattambiar) - and sister of Justice Siva Selliah, High Court Judge.

[9] They have two children: (1)Arunachala Manicavasagar, JP, who married Skandaleela - daughter of Proctor Sivakolundu Rajendran (JP, NP) and his wife Kamalambigai, youngest daughter of Stowell Elaithamby Murgesampillai - and his younger sister, (2)Nirmala Ragunanthan, who was married to the late Ragunanthan Thambimuthu, Managing Director of Raniyo (Pvt) Ltd.