Canadian police earlier this month arrested and charged three Indian men in the city of Edmonton in Alberta and said they were probing whether the men had ties to the Indian government.
The Integrated Homicide Investigation Team (IHIT) announced on Saturday that Amandeep Singh, 22, has been charged with first-degree murder and conspiracy to commit murder in Nijjar's killing.
Singh, an Indian national who resided in Brampton, Surrey and Abbotsford, was already in custody for unrelated firearms charges out of Peel, Ontario, IHIT said.
Nijjar, 45, was shot dead in June outside a Sikh temple in Surrey, a Vancouver suburb with a large Sikh population. A few months later, Canadian Prime Minister Justin Trudeau cited what he said was evidence of potential Indian government involvement, prompting a diplomatic crisis with New Delhi.
Nijjar was a Canadian citizen campaigning for the creation of Khalistan, an independent Sikh homeland carved out of India. The presence of Sikh separatist groups in Canada has long frustrated New Delhi, which had labelled Nijjar a "terrorist".
Canada has been pressing India to co-operate in its investigation. Last November, US authorities said an Indian government official had directed the plot in the attempted murder on US soil of Gurpatwant Singh Pannun, a Sikh separatist and dual citizen of the US and Canada.
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