John Deacon, appellant, brought a case against Charles Oliver and Robert M. Gibbes, executors of the estate of Robert Oliver who had passed away. The dispute was over an unpaid debt that John Deacon claimed he was owed by the deceased man's estate. After hearing both sides' arguments in court, it was determined that there were no grounds for recovery as the debt had been paid off prior to his death according to documents presented during trial. Therefore, John Deacon's appeal failed and he did not receive any compensation from the executors of Robert Oliver's estate.

In the case of John Deacon v. Charles Oliver and Robert M. Gibbes, Executors of Robert Oliver, Deceased, Justice McLean delivered a dissenting opinion in which he argued that the executors should be held liable for damages caused by their negligence while managing the estate of Robert Oliver. He reasoned that since they had been appointed to manage and protect his property with due care and diligence, it was only fair to hold them accountable when they failed to do so. Furthermore, he noted that if no liability were imposed on such fiduciaries then there would be little incentive for them to act responsibly or take proper precautions when handling an estate’s assets. In conclusion, Justice McLean believed that holding executors responsible for any losses incurred through their negligence was necessary in order to ensure justice is served and encourage greater accountability among those entrusted with managing estates.