The Fitness to Practise Committee of the Medical Council has found north Dublin GP Dr Peter Ting guilty of professional misconduct.
The inquiry team said it would make recommendations on what sanctions should apply to a full meeting of the Medical Council.
Earlier, Dr Ting told the inquiry he believed he acted in the best interests of a patient who subsequently died from cancer in May 2008.
Dr Ting said if he had believed a mole he removed from the patient's back in February 2007 was sinister, he would have referred the patient to a dermatologist.
He told the inquiry that he "regretted terribly" that he did not keep a record of the removal of the mole.
He said that in May 2007, he referred the patient, 36-year-old William Cashell from Rush, for an urgent out-patient specialist appointment at Beaumont Hospital, when a lump under his arm developed.
An appointment was set for 17 August 2007.
However, before that date Dr Ting referred Mr Cashell to the hospital's emergency department, as the lump had doubled in size and the patient was in pain.
After blood tests and a chest x-ray did not highlight concerns, the hospital referred the patient back.
Dr Ting said he delayed responding to the Medical Council after a complaint was made against him, following Mr Cashell's death.
He said he was upset, as it was the first time in his career he had ever been called to respond to a serious allegation.
He knew Mr Cashell as an acquaintance as the patient worked in the Northside Shopping Centre.
Limerick GP Dr Mary Gray told the inquiry that while it was not desirable, full medical records are not always kept due to human pressures.
She said she did not believe the evidence supported an allegation of professional misconduct in relation to an alleged failure by Dr Ting to refer Mr Cashell for specialist assessment.
At the end of the inquiry, Mr Cashell's father, Michael, said it had been a difficult number of years for the family but today’s outcome had brought closure.
