Tim Bosma trial: How police used cellphone records to investigate

A Hamilton court is expected to hear testimony today from an expert witness about exactly how cellphone records and tower locations helped police investigate Tim Bosma's disappearance.

The trial of the two men accused of killing the Hamilton man after he disappeared in 2013 while out on a test drive of his truck continues Tuesday.

​​​Sgt. Stuart Oxley testified Monday that the arrest of Dellen Millard was made at gunpoint on May 10, 2013, days after Bosma vanished. Hamilton police officers boxed in Millard's GMC Yukon at a stop sign on Cawthra Road in Mississauga, Ont.

Oxley testified he walked toward the driver-side window of the SUV with his gun drawn.

"I approached the car myself with my gun drawn. He looked over at me and put his hands up," Oxley said. "I said, 'Are you Dellen Millard?' He said 'yes.'"

Millard, 30, of Toronto, and Mark Smich, 28, of Oakville, Ont., have both pleaded not guilty to first-degree murder.

Follow CBC's Adam Carter's live coverage Tuesday. Court begins at 1 p.m. ET. On mobile? Can't see the timeline? View it here.

adam.carter@cbc.ca