A baby found dead alongside his mother at the weekend may have died from an insulin overdose, Gardaí believe.
The bodies of baby Vincent Donohoe (11 months) and his mother Kate (44) were discovered together on a bed in an upstairs bedroom of their home on Saturday.
Emergency services rushed to the house in Clonee, Co Dublin after being contacted by a neighbour.
However, it is believed that the mother and child may have been deceased for up to 48 hours at that stage.
It is understood a detailed note was recovered by Gardaí.
This note has led to the tragedy being classified as a criminal investigation but investigators are not looking for anybody else in connection with the deaths.