He was born on 13 June in Panadura. He went to Wekada Bauddhaloka Vidyalaya where he met drama teacher Sarath Kulanga.
Chandrasiri is married to longtime partner Charika Jayamali. The couple has one son – Kanchuka Thilakshana, and one daughter – Hasara Nilakshi. Kanchuka is an engineer graduated from University of Moratuwa. Hasara is a physics graduate at University of Sri Jayewardenepura.
On 21 November 2016, Chandrasiri was hospitalized by a brief illness while working in a stage play. He was rushed into the Alpitiya hospital. In November 2021, he was again hospitalized and has been receiving treatment at the Intensive Care Unit of the Colombo National Hospital for the many weeks due to an internal hemorrhage. During that period, false rumors circulated that he died at the hospital. Later on 4 December 2021, he died at the age of 57 while receiving treatment at National Hospital, Colombo due to cerebral hemorrhage.
Chandrasiri started drama career under the guidance of his teacher Sarath Kulanga. Meanwhile, he met several other playwrights including Janak Premalal and Jayalath Manoratne through Kulanga. Under them he acted in many stage plays such as Abuddassa Kolama, Raja Kapuru, Andarela, Thalamala Pipila, Guru Tharuwa and Puthra Samagama.
