Who is Arsh Dala, Khalistani separatist Nijjar's aide arrested in Canada?

Arshdeep Singh, also known as Arsh Dala, a wanted close aide of assassinated Khalistani separatist Hardeep Nijjar, has reportedly been arrested in Canada's Ontario. Arshdeep has been accused in several criminal and terror activities in Punjab, including murder of Congress leader Baljinder Singh Balli in Moga in September last year. He was designated a terrorist by Indian government last year.