MILTON, Ont. -- A 51-year-old woman facing charges in the death of her toddler grandson after he was left in a sweltering car is due back in a Milton, Ont., courtroom on Sept. 9.

Leslie McDonald was charged with criminal negligence causing death and failing to provide the necessities of life after her grandson, Maximus Huyskens, died on June 26 -- a month before his second birthday.

Police have said the boy died after being exposed to high-level temperatures for an extended period of time in a car outside a Milton home.

Investigators have said the child was in the care of his maternal grandmother while his father was at work and his mother was at an appointment.

McDonald did not appear in court on Tuesday for her scheduled appointment; rather a representative of her lawyer stood in.

Her next court appearance is scheduled for Sept. 9, 2013 at 9 a.m.

With files from The Canadian Press