"They covered the body with a sheet and then removed the blankets around him. He was dead."
A white company van standing nearby was thought to have been the vehicle in which the man was brought to the clinic.
A worker at a nearby BP petrol station said a fireman had told him that the man had been fatally injured.
"I spoke to one of the firemen. He said that [the guy] got stabbed and he's died - he's lost his life."
While another witness told the Herald that the medical centre's entrance had been covered by large blue tarpaulins, blocking anyone from seeing inside.
"It looks like a crime scene - there are police officers everywhere, cop cars and three ambulance vehicles."
In a statement released last night, police said they had launched an investigation following the incident, in which a male had arrived at the clinic with serious injuries.
This morning, police confirmed it was a homicide investigation.