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David Angle, the 63-year old brother of former Olympics and World Wrestling Entertainment Inc., pleaded guilty on Tuesday to killing his wife, Donna Angle, at their Dormont home last fall.David Angle had been charged with homicide but his plea agreement is to the lesser charge of voluntary manslaughter.Video: Watch Bob Mayo's report"It was really a product of alcohol. And there was a domestic fight where she started smacking him and he stopped her from doing that. His knees were on her chest and basically she suffocated. And he was intoxicated as well and it was almost accidental," defense attorney Bill Diffenderfer told Pittsburgh's Action News 4.Some relatives of the defendant and the victim were in the courtroom as the plea was entered. Kurt Angle, who attended his brother's preliminary hearing last fall, was not at court Tuesday."His three children were here. He has a stepson. Ian was here and his daughter and son -- both from the deceased and him -- their children were here. And they're in very much supporting their father," Diffenderfer said.The prosecution told the court that some details of David Angle's story of what happened in the couple's home on Sept. 20, 2015, changed over time. In all of his accounts, however, he admitted his use of force stopped his wife from breathing. David Angle called 911 to the scene."He's in complete disbelief that he doesn't have his wife. They've been married for 26, 27 years. He loves her. He misses her every day and he's just devastated by what happened," Diffenderfer said.David Angle will be sentenced on September 20. He faces a maximum of 10 years in prison but Difenderfer said sentencing guidelines could put his sentence closer to two years. David Angle remains in the Allegheny County Jail.