PORTAGE, Wis. -- A man and woman who are accused of killing a woman and torturing her son are scheduled to appear in Columbia County court on Monday afternoon.

Michael Sisk, 26, and his girlfriend, Candace Clark, 24, are accused of torturing an 11-year old boy and killing his mother, Tammie Garlin, last summer in the house they shared in Portage.

Sisk and Clark each face multiple charges that include being a party to first-degree intentional homicide, child abuse and false imprisonment.

Investigators said Sisk and Clark led a group of scam artists across the country.

Last June, police said they discovered the boy locked in a closet with burns all over his body in a home the group rented in Portage. Officers also found the body of the boy's mother buried in a shallow grave behind the house.

Monday's hearing will look at whether to change venue and have separate trials.

Last March, Another woman who was arrested along with Sisk and Clark, 21-year-old Michaela Clerc, pleaded no contest to being party to false imprisonment, mayhem, causing a child mental harm and physical child abuse. Clerc was accused of helping whip and burn the boy and helping stuff him in a closet naked and malnourished.

Stay tuned to WISC-TV and Channel 3000 for continuing coverage.