LaToya Jackson tweeted: "VICTORY!!!!!!" after leaving the court following the conviction of Dr Conrad Murray for the involuntary manslaughter of her brother Michael Jackson
LaToya, a former Celebrity Big Brother contestant, admitted that she was "shaking uncontrollably" when going to hear the verdict.
Family members watched the trial unfold from the public gallery.
La Toya said she was overjoyed. "Michael was looking over us," she said on her way out of the courthouse.
She later told her Twitter followers: "Michael I love you and I will continue to fight until ALL are brought to justice!"
The star's father Joe told reporters: "Justice was served," and Jermaine Jackson, the singer's brother, added: "Michael is with us."
Mother Katherine Jackson later said: "I feel better now."
Asked if she was confident this would be the outcome, she replied: "Yes I was."
His sister Rebbie Jackson said outside court: "It's not going to bring him back but I'm happy he was found guilty."
SLIDESHOW: See photos from throughout the Conrad Murray trial...