A Saskatoon woman is facing eight additional charges after a family of four was killed in a highway crash.

Catherine McKay, 49, is now facing four counts of dangerous operation of a motor vehicle causing death and four counts of impaired operation with a blood alcohol reading over .08 causing death.

McKay was already charged with four counts of impaired driving causing death.

van de vorst family

Jordan and Chanda Van de Vorst and their two-year-old son, Miguire, and five-year-old daughter, Kamryn, were killed in a weekend highway crash in Saskatoon. (Van de Vorst family Facebook vigil)

Jordan and Chanda Van de Vorst were killed early Sunday morning when their car was hit on Highway 11, on the outskirts of Saskatoon. Five-year-old daughter Kamryn and two-year-old son, Miguire, died later in hospital.

McKay made a brief court appearance on Tuesday, and is set to appear in court again on Thursday.

A memorial service will be held this weekend for the Van de Vorsts. The funeral will be held at Saskatoon's Elim Church at 11 a.m. CST on Saturday, January 9.