The bulk of Monday’s testimony at the murder trial of Dellen Millard and Mark Smich centred around blood found in Tim Bosma’s pickup truck, how it got there and what happened to it before police seized the truck.

Millard and Smich have pleaded not guilty to first-degree murder in connection with the death of Bosma, who disappeared in the spring of 2013 after taking two strangers for a test-drive of a truck he was attempting to sell.

The search for Bosma brought police to the outskirts of Brantford – where they found his cell phone – as well as a North Dumfries farm owned by Millard, and the Region of Waterloo International Airport.

It is alleged that Millard and Smich killed Bosma and burned his remains in an animal incinerator which had previously been delivered to the airport, and eventually wound up on the farm.

The trial, which is being held in Bosma’s hometown of Hamilton, has heard that blood found in Bosma’s truck cannot be excluded as being his.

Sgt. Robert Jones, a blood spatter expert with Waterloo Regional Police, was on the witness stand for much of Monday’s testimony.

Asked if he found anything inconsistent with the idea that somebody was shot while sitting in the passenger seat of Bosma’s truck, Jones replied that he did not.

Among Jones’ other findings were that a “bloodletting event” had occurred in the vehicle, and that there was evidence of an attempt to clean up blood inside and outside the vehicle.

He noted several instances of what he described as “altered” stains – meaning blood stains that had changed in some way since they were created.

Many of them were indicative of an attempt to clean up the blood, possibly with a hose or power washer, he said.

Under cross-examination, Jones was asked why his notes didn’t include any reference to a shell casing found in the truck.

“The casing tells me nothing when it comes to blood stain analysis,” he responded.

Following testimony from Jones, the trial heard briefly from a gunshot residue expert employed by the Centre of Forensic Sciences.

That testimony ended abruptly when a jury member became ill, but is expected to resume Tuesday.