Jennifer Hudson is on the witness list for the upcoming trial of a man accused of killing her mother, brother and seven-year-old nephew.
The Chicago Tribune reports, however, that prosecutors have not yet disclosed whether the Oscar winner will actually testify at William Balfour's trial, which is set to begin on April 9.
Balfour was the estranged husband of the Dreamgirls star's sister, Julia.
Jennifer's mother, Darnell Donnerson, 57, and brother, 29-year-old Jason, were found dead in the family's home on Chicago's South Side in 2008.
The body of her nephew, Julian King, was found days later in a vehicle on the city's West Side.
A court filing by prosecutors last week contains detectives' reports from interviews with Jennifer after the deaths.
According to the filing, the actress and singer told investigators she had known Balfour since childhood and had advised her sister against marrying him.