The 11 month old was found by his mum Anna, last Sunday when she returned home from work.
The child’s father, 32-year-old Andrzez Piolunowicz was also found with serious injuries, believed to be self inflicted stab wounds; he passed away on Thursday.
Ms Rozycka returned to her native Poland yesterday for today’s funeral service.
Karol’s burial is taking place today at 2 o’clock Irish time in her home town of Bielsko-Biala, near Krakow.
He will be laid to rest surrounded by floral wreaths sent by the community in Killarney.