A death within the State can be registered with any Registrar, irrespective of where it occurs. Deaths must be registered as soon as possible after the death and no later than three months from the date of death.
Upon the death of a person following an illness, a registered medical practitioner who attended the deceased during the illness must complete and sign Part 1 of the Death Notification Form, stating to the best of his or her knowledge and belief the cause of death.
The registered medical practitioner must give the Death Notification Form to a relative or civil partner of the deceased, provided a relative or civil partner exists and that the relative or civil partner is capable of acting as a qualified informant.
The relative or civil partner must complete and sign Part 2 of the form, which concerns additional personal details of the deceased. Upon completion of Part 2, the relative or civil partner must give the form to any Registrar of Deaths as soon as possible but no later than three months from the date of death. In order to complete the registration, the relative or civil partner is required to sign the Register of Deaths in the presence of the Registrar.
https://www.welfare.ie/en/Pages/Registering_Death.aspx