Suspect strategy: Defence challenges cops on 6-hour interrogation of accused killer Greg Fertuck

Prosecutors say police drew key admissions from murder suspect Greg Fertuck in a marathon six-hour interrogation after his arrest on Oct. 25, 2017, for the alleged murder of his wife Sheree Fertuck.

On Thursday, Greg's lawyers challenged the two officers about their tactics.

Sheree vanished six years ago and Thursday's cross-examination unfolded on what would have been her 57th birthday.

Greg is on trial before a judge alone at Court of Queen's Bench in Saskatoon, accused in Sheree's death. Her body has never been found, but her semi-truck was discovered abandoned in a gravel pit near Kenaston, Sask., on Dec. 8, 2015.

He has pleaded not guilty to the first-degree murder charge.

Staff Sgt. Charles Lerat did the primary interview with Greg in 2017, while Sgt. Chad Clark did an evidence presentation that included photos, maps, text messages and video pleas from Greg's adult children.

Defence lawyer Morris Bodnar asked Lerat whether he'd ever heard the expression "tunnel vision" when it came to police investigations and, if so, what it meant to him.