The Honourable Madam Justice Myrna L. Lack ("Lack J." in bylines) — a judge of the Ontario Superior Court of Justice, seated in the Central East Region (Whitby/Oshawa, Durham Region), who also sat as a member of the court's Divisional Court branch (Ontario Courts — Former Judges; Canadian Law List — The Hon. Myrna L. Lack).
The database record "M. L. Lack" (id 1619) corresponds to Myrna L. Lack; the full name is verified by the original federal appointment release (Justice Canada, March 18, 1998 (archived)), the official Ontario Courts Former Judges register, and three legal directories.