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CLEVELAND -- The details are shocking and hard to believe, but authorities say a woman -- who was believed to weigh around 300 lbs. at the time -- sat on her boyfriend and killed him last summer.On Wednesday, Mia Landingham, pleaded guilty to involuntary manslaughter in the death of her 120 lb. boyfriend, Mikal Middleton-Bey.It happened back in August during an altercation between the couple, who share three children together.During Landingham's sentencing, her boyfriend's family spoke of the pain she has caused their family."I just want to let you know how much you have hurt us by taking Mikal away from us," said Sharon Phillips, the victim's step-mother.Landingham's public defender told the judge there was a long history of domestic abuse between his client and her late boyfriend.He also pointed out she has no prior criminal record.Landingham, then told the judge she was sorry for squashing the father of her children. "I just want to say that I am sincerely sorry about this situation... I wish I could take it back."Judge Carolyn Friedland sentenced her to three years probation and 100 hours community service.Landingham was then immediately released from jail.While Middleton-Bey's family hoped Landingham would eventually be able to take part in her children's lives, they were surprised that she got no additional jail time."So basically you can say that I can go sit on somebody and get probation?" said one of the victim's sister."I feel there wasn't no justice."Landingham faced a maximum of five years behind bars.