A day after police confirmed that her 7-year-old son had been found dead in the backseat of a car on Chicago's West Side, Julia Hudson called son Julian King "my innocent baby" on her My Space page.
Balfour threatened Julia Hudson again that morning at the home, she alleged, saying Hudson did not take the threat seriously because he "had not followed through on any of those threats" before.
The two left the home together that morning, with Ms Hudson driving away as she saw Mr Balfour walking toward his own car, according to documents prosecutors filed with the court.
"Several people observed defendant with the gun in the late summer of 2008," Snow said.
Balfour was taken back to his disabled car after the trip to the gas station, "although he was offered a ride to other locations," Snow told the court.
The murder of Jason Hudson occurred on October 24, 2008, when 29-year-old Jason Hudson and his 57-year-old mother, Darnell Donerson, were discovered shot to death inside Donerson's home in Chicago, Illinois.
The victims were the brother and mother of singer Jennifer Hudson.
But his car broke down and two acquaintances gave him a ride to a gas station — during which time Mr Balfour told them he had a handgun, but had left it in his car, Ms Snow alleged.
In fact, the prosecutor said, the gun belonged to Jason Hudson and Mr Balfour allegedly stole it during the summer.
In the aftermath of the deaths, Hudson's family announced the creation of the Hudson-King Foundation for Families of Slain Victims, a foundation "to care for the needs of families who have lost relatives to a violent crime," according to a statement released to the press.
She rose to fame in 2004 as a finalist on the third season of American Idol, coming in seventh place.
Jennifer Hudson, who won an Oscar for her role in Dreamgirls, sang the national anthem at the Democratic National Convention in August.