Expert casts doubt over Crown's case in last day of evidence in David Benbow murder trial

Friday marked the last full day of evidence in the David Benbow murder trial.

Six weeks of evidence to a jury of seven men and five women who next week will decide if Benbow murdered his childhood friend Michael McGrath.

Six weeks of sitting in the High Court in Christchurch, and murder-accused David Benbow looked tired.

Next week the jury will begin to deliberate. Friday saw more evidence casting doubt on the Crown's case.

Forensic video analyst David Horsburg told the court the CCTV footage the Crown case is using to track the pair's movements around the time of the alleged murder is unreliable.

He repeatedly questioned evidence given by the Crown's own CCTV expert.

"I disagree with that," said Horsburgh.

"Yes I dispute that," he continued.

"I remain concerned about the times on the time stamp."

"Inaccurate and unreliable."

"It's impossible to accurately state that fact."

He told the jury the crucial CCTV vision of McGrath's car heading to Benbow's house on the day of the alleged murder isn't clear enough to know it's his blue Subaru.

Horsburgh said "there are two issues with that identification. The first is the angle of view of the camera. And the second thing is the resolution of the camera".

Under cross-examination, he went even further with his views.

"I find it appalling sir, as a person who worked on numerous homicides that a camera closest to the scene of an alleged murder was never examined on the day of the alleged murder. And I find that disgraceful," he said.

After six full weeks, the jury has now heard all the evidence in this case. As have Michael McGrath and David Benbow's mothers who have both sat through the entire trial.

After both sides sum up next week, the jury is expected to begin their deliberations to decide if Benbow is a murderer.

A murder without a body - or a murder weapon.