The trial of William Barfour begins Monday.

He is charged with killing three members of actress Jennifer Hudson's family: her mother, 57-year-old Darnell Donerson, her brother, 29-year-old Jason Hudson, and her nephew, 7-year-old Julian King.

On Monday, jurors will hear testimony from the suspect's ex-wife, who is also Jennifer's sister, Julia Hudson.

Julia and Balfour, married in 2006, became estranged and Balfour moved out of her family's home in May 2008.

The murders occurred in October 2008.

Prosecutors say Balfour had threatened Julia's family more than two dozen times prior to the incident, after she told him that she had decided to start seeing another man.