CHICAGO (AP) - A Chicago jury has convicted Oscar-winner Jennifer Hudson's former brother-in-law of murdering her mother, brother and 7-year-old nephew in what prosecutors described as an act of vengeance by a jilted husband.

The jury convicted 31-year-old William Balfour on three-counts of first degree murder on Friday, after three days of deliberations. He faces a mandatory sentence of life in prison.

Prosecutors had to build an overwhelming circumstantial case tying Balfour to the killings because there were no surviving witnesses. Defense attorneys claimed the killings could have been related to Hudson's brother's alleged drug dealing.

Hudson was the first witness called to the stand and she attended every day of testimony.

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Watch "Jennifer Hudson Takes the Stand as Murder Trial Begins"

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