This is the best summary I could come up with:

courtroom to answer charges on an unrelated matter just two days before, according to police, he lay in wait for Nijjar at the entrance to the Guru Nanak Sikh Gurdwara.

court documents from last June also show that Singh signed an undertaking agreeing to not possess firearms or ammunition, and to not be in the driver's seat of any motor vehicle.

Amandeep Singh was not among the first group of three men arrested by the RCMP in connection with Nijjar's killing on May 3 in raids in the Edmonton area.

Sources inside the police investigation, and sources in the government of Canada with knowledge of its intelligence-gathering and intelligence-sharing with Five Eyes partners, have told CBC News that evidence connects the murder plot directly to the government of Indian Prime Minister Narendra Modi, now campaigning to win a third term as leader of the world's most populous nation.

Like the other three accused, Amandeep Singh is believed by investigators to be affiliated with an Indian organized crime group led by Punjabi gangster Lawrence Bishnoi.

Amandeep Singh has been in custody since his car was stopped in Brampton on Nov. 3 by the Special Enforcement Bureau of the Peel Regional Police.

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Not much info on what led to the initial arrest.