Travis Vader's lawyer told court in the community of Edson that he needs more time to go over the file.
Vader is charged in the first-degree murders of Lyle and Marie McCann of St. Albert, just north of Edmonton.
A date was to be set last month for Vader’s preliminary hearing, but his lawyer also asked then for more time to review the evidence.
The McCanns were last seen alive on July 3, 2010, when they left their home to visit family in British Columbia.
Their burned-out motorhome was found two days later west of Edmonton, but their bodies have not been found.