Jennifer Hudson’s estranged brother-in-law, William Balfour, has finally been arrested for the deaths of Hudson’s mother, brother and 7-year-old nephew. Balfour was arrested today at the prison where he was held for a parole violation.

William Balfour, 27, was waiting for formal charges for the shooting deaths of Jennifer Hudson’s family members.

Balfour had previously been considered a “person of interest” in the investigation.