The popular taxi driver and coal man, from Waterview, Lower Point Rd, Dundalk, Co Louth, died on September 28, 2015.
His body was found on the roadway at Carnmore, Dundalk, close to his taxi.
Louth County Coroner Ronan Maguire yesterday read depositions from Garda Inspector Martin Beggy, who identified Mr Mulligan, and from Michael Curtis, the deputy State pathologist, who carried out an autopsy on him.
At Dundalk Coroner’s Court, Mr Maguire said the full postmortem report from Dr Curtis runs to 11 pages but, for the purpose of the inquest, he had given Mr Maguire a truncated one-page version.
The inquest heard that Insp Beggy was contacted by Garda Superintendent Gerry Curley, Dundalk, on September 28, after which he went to the scene at Carnmore where he saw Mr Mulligan.
He had known the deceased “for the last 20 years”, Insp Beggy said in a statement.
He then identified Mr Mulligan to Dr Curtis in Our Lady of Lourdes Hospital, Drogheda later that day where the autopsy took place.
In his deposition, Dr Curtis gave the cause of death as stab wounds to the abdomen and right thigh, with injuries to the right aorta and femoral artery.
Mr Maguire said he had sufficient evidence to issue a death certificate.
He adjourned the inquest at the request of the gardaí, as their investigation is continuing.
Mr Mulligan’s widow, Grainne, was comforted by family members following the inquest hearing.