William Balfour was convicted Friday of killing the mother, brother and 7-year-old nephew of pop star and award-winning actress Jennifer Hudson.
The verdict was returned by a Chicago jury of six men and six women who began deliberations Wednesday.
Balfour, Hudson’s former brother-in-law, had pleaded not guilty to three counts of first-degree murder in connection with the 2008 slayings. The charges carry a mandatory penalty of life in prison.
Prosecutors alleged that Balfour, 30, was upset that his estranged wife -- Hudson's sister, Julia -- had begun seeing another man and wanted a divorce.
The defense maintained that Balfour was the victim of a hurried investigation by police seeking to arrest someone in a high-profile case and that the killings were related to Hudson’s brother’s cocaine business, which he operated out of the family home.