Don Lovett, a communications consultant, was one of a number of character witnesses called by the defence at Tamara Lovett's trial.
Niagara regional police say Layla Sabry and her mother Allana Haist were last seen on Thursday evening in Welland, Ont.
David MacDonald's body was found Sunday afternoon by members of the Nelson House RCMP detachment and the Cross Lake community fire department.
Tamara Lovett, 47, took the stand in her own defence to answer to charges that she failed to provide her seven-year-old son with the necessaries of life and is guilty of criminal negligence causing his death.
At issue is whether Canadian courts have the jurisdiction to make sweeping orders to block access to content on the Internet beyond Canada's borders.
Bill Hogan, principal of Woodstock High School, would not reveal any details about the matter or explain why the whole team was suspended.