From the Malacca High School, he obtained a scholarship to study medicine at the University of Malaya in Singapore.
Rajakumar and the Fajar board were defended by the radical British QC Denis Pritt, with Lee Kuan Yew (later the first Prime Minister of Singapore) as junior counsel.
His political influence waned after the decline of the Barisan Socialis in the late 1960s and he focused primarily on his career in medicine.
[11] Rajakumar's daughter Datin Sunita is married to the son of former senator Tan Sri Dr C. Sinnadurai.
[12] He died on 22 November 2008 at 3am in Hospital Kuala Lumpur aged 76, from heart and lung complications following a bout of pneumonia.