Jan 3 (Reuters) - A former Colorado funeral home owner was sentenced to 20 years in federal prison on Tuesday for defrauding relatives of the dead by dissecting 560 corpses and selling body parts without permission.The federal case was triggered by a 2016-2018 Reuters investigative series about the sale of body parts in the United States, a virtually unregulated industry.Koch told the judge she was sorry and took responsibility for her actions.Hess committed crimes, prosecutors said, when she defrauded relatives of the deceased by lying about cremations and by dissecting bodies and selling them without permission.The surgical-training companies and other firms which bought the arms, legs, heads and torsos from Hess did not know they had been fraudulently obtained, prosecutors said."