A Chicago jury May 11 convicted William Balfour of murdering family members of R&B singer Jennifer Hudson.

The jury of six men and six women found Balfour guilty of three counts of first-degree murder, home invasion, residential burglary, aggravated kidnapping and possession of a stolen vehicle in the October 2008 killings.

Balfour was accused of killing Darnell Donerson, 57, Jason Hudson, 29, and 7-year-old Julian Hudson because he was angry at Hudson’s sister, Julia Hudson, to whom he was married at the time.

According to the ABC News.com, the jury deliberated for more than 18 hours over three days, overcoming a 9-3 split to arrive at a unanimous verdict. This comes after an 11-day trial which produced 84 witnesses, including an emotional Hudson.

On April 23, the Academy-award winner took the stand against Balfour. She fought back tears as she recalled the day her sister told her she was going to marry him.

“None of us wanted her to marry him,” she said according to the Associated Press. “We did not like how he treated her.”

The closing arguments were no less emotional as both sides played to the jury to get the verdict they wanted.

Balfour’s defense team claimed there was no DNA evidence against him and implied that police planted a set of keys a month after the murders as evidence to get the man they wanted.

“Those keys show how desperate the state was. They resorted to this,” Balfour’s attorney Amy Thompson said, according to CNN. “My client is an innocent man.”

Meanwhile, the prosecution painted Balfour as an angry ex-lover who had a mountain of circumstantial evidence against him.

“If you leave me, I’ll kill you. I’ll kill your family first,” Cook County Prosecutor Jennifer Bagby said Balfour told Julia Hudson, according to CNN. “You’ll be the last to die.

“He went in that house for one reason, and one reason only, to carry out that threat,” she continued.