A judge ruled Tuesday that Dr. Jeffrey MacDonald, the former Green Beret physician convicted of killing his wife and two daughters, may keep only $50,000 of the $325,000 in profits he received from a book on his life story, a lawyer said.

Superior Court Judge Edward Ross ruled that Dr. Jeffrey MacDonald cannot collect the full proceeds from the book because he would be profiting from the murders, said Bill Price, a lawyer for MacDonald's mother-in-law, Mildred Kassab.The $50,000 MacDonald can keep settles a suit he filed against Joe McGinnis, the author of the book "Fatal Vision," accusing McGinniss of misrepresenting himself when he sought MacDonald's cooperation in writing the book, Price said.