The fire at Gordon Seybold's home left his remains so charred it was impossible for forensic officials to conclusively determine a cause of death.

Both a forensic pathologist and anthropologist testified Tuesday at the trial of the woman accused of murdering the 63-year-old four years ago.

Seybold's remains were found under the metal roof of his Ibex Valley cabin after the home burned to the ground on March 26, 2008. 

Christina Asp, 34, is currently on trial for first-degree murder in Yukon Supreme Court.

Forensic anthropologist Dr. Richard Lazenby, who examined Seybold's bones for signs of trauma, estimated that only 10 to 12 per cent of the man's skeleton was recovered following the fire. That includes less than half of his skull.

Many of the bones recovered from the scene were in pieces, warped and cracked from the heat of the fire, he said.

Lazenby testified he found no signs of trauma prior to the fire on the bones he was able to examine.

The anthropologist's testimony echos that of the pathologist who performed an autopsy.

The fire left few internal organs available to be examined, said Dr. Charles Lee, a forensic pathologist.

Lee told the jury of 12 women and two men that the largest piece of Seybold's body he was able to autopsy was the lower abdomen and pelvis area.

The pathologist testified he found no signs of blunt or penetrating trauma in what he was able to examine.

The jury has already heard a secretly-filmed video of Asp telling an undercover police officer that she had hit Seybold in the head with a baseball bat while attacking him alongside her boyfriend.

Lee said low carbon monoxide levels found in Seybold's kidney tissue suggest he may have died prior to the fire starting. But without more of the body to test, the doctor couldn't say for sure.

In an ideal scenario, a pathologist would have been able to check Seybold's airway for soot or examine the colour of his tissue, Lee testified.

Since Seybold's upper organs were not recovered and his remaining tissue was so charred by fire, neither of these tests were an option.

Crown prosecutors have said from the beginning of the three-month trial that much of the evidence at the scene burned to the ground along with Seybold's home.

In the organs Lee was able to examine, he noted some evidence of cardiovascular disease, he said.

But again, without more information, he could not say if that contributed to Seybold's death.

The pathologist also told the court there was no way of telling whether Seybold had a stroke, given the condition of the skull.

The jury has already heard Seybold had a stroke in the year prior to his death.

Both Lazenby and Lee appeared in court via video conference.

The case is being heard before Justice Leigh Gower.