William Balfour, the estranged brother-in-law of Oscar-winning actress Jennifer Hudson, has been arrested in Illinois in the deaths of the singer’s mother, brother, and 7-year-old nephew.

The body of Jennifer’s mother and brother were found shot to death on Oct. 24, and her nephew’s body was found three days later.

Balfour, a convicted felon, was arrested Monday at a prison where he is being held on a parole violation.