Onion Lake RCMP: 2 arrested, 1 wanted following flight from police during traffic stop

May 21, 2026 - Onion Lake, Saskatchewan
From: Saskatchewan RCMP

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Two individuals have been arrested, and one suspect is wanted by Saskatchewan RCMP after a vehicle fled from an attempted traffic stop. 

On May 17, 2026, at approximately 5:10 p.m., Onion Lake RCMP observed a vehicle driving at a high rate of speed near Onion Lake. Officers activated their vehicle’s emergency equipment and initiated a traffic stop. The vehicle did not stop. A short time later, the vehicle stopped near French Butte, and two of the vehicle’s occupants fled from it on foot. Two occupants remained in the vehicle and were arrested.

During a search of the vehicle, officers located and seized a loaded firearm. 

Onion Lake RCMP Detachment engaged the Lloydminster Crime Reduction Team (CRT), part of the Saskatchewan RCMP’s Saskatchewan Enforcement Response Teams (SERT), North Battleford Police Dog Services (PDS), and Rosetown RCMP and Kindersley RCMP Combined Traffic Services to assist with locating the outstanding suspects. 

A police dog tracked one suspect for approximately five kilometres and he was arrested.

As a result of continued investigation, Matthew Chief, a 40-year-old from Onion Lake, is charged with: 

• one count, resist/obstruct peace officer, Section 129(a), Criminal Code;
• one count, possession of a firearm when knowing possession unauthorized, Section 92(1), Criminal Code;
• one count, unsafe storage of firearm, Section 86(2), Criminal Code;
• one count, possession of firearm in motor vehicle, Section 94(1), Criminal Code;
• one count, possession of a prohibited weapon when knowing possession unauthorized, Section 92(2), Criminal Code; and
• one count, possession contrary to order, Section 117.01(1), Criminal Code.

Timothy Weeseekase, a 35-year-old from Onion Lake, is charged with one count, possession of firearm, Section 94(1), Criminal Code.

Matthew Chief appeared in Lloydminster Provincial Court on May 19, 2026. Timothy Weeseekase is scheduled to appear in Lloydminster Provincial Court on July 15, 2026. 

The other vehicle occupant has been released without charge.

Onion Lake RCMP is seeking to locate the other male suspect. The public is asked to report sightings and information on the whereabouts of 44-year-old Aaron Chief from Onion Lake. A warrant has been issued for his arrest. 

Aaron Chief is charged with:

• one count, flight from peace officer, Section 320.17, Criminal Code;
• one count, dangerous operation of a motor vehicle, Section 320.13(1), Criminal Code;
• one count, resist/obstruct peace officer, Section 129(a), Criminal Code;
• one count, possession of a restricted firearm with ammunition without licence/registration, Section 95(1), Criminal Code;
• one count, unsafe storage of firearm, Section 86(2), Criminal Code;
• one count, possession of firearm in motor vehicle, Section 94(1), Criminal Code;
• one count, possession of a prohibited weapon when knowing possession unauthorized, Section 92(2), Criminal Code; and
• one count, possession contrary to order, Section 117.01(1), Criminal Code.

Aaron Chief is described as: 

• Height: 5 ft 9 in
• Weight: 180 lbs
• Eye colour: brown
• Hair colour: black
• Other descriptors: facial hair, tattoo on neck

If you see Aaron Chief, do not approach him. Report all sightings and information on his whereabouts to Onion Lake RCMP by calling 310-RCMP. Information can also be submitted anonymously by contacting Saskatchewan Crime Stoppers at 1-800-222-TIPS (8477) or www.saskcrimestoppers.com.