A nurse was described as being in “good spirits” by neighbours just hours before her body was found under a bridge and her son found dead at home.
Police went to the home of nurse Nicola Keane, 34, after locating her body in Strawberry Beds, Dublin, on Thursday morning.
The devastated father was unaware that his baby boy was dead in the upstairs room, it is understood. A post-mortem revealed that the infant died of asphyxiation.
A source said police are not looking for anyone else in connection with the deaths and the incident is being treated as a family tragedy.
Neighbours said they were in “total shock” after the tragic finds on Thursday morning, reports the Irish Daily Mail.
“Nothing seemed out of the ordinary when I saw her pushing her child around the estate in his buggy.
“We didn’t know each other on a first-name basis, but the family were very pleasant and friendly.
“I’m just in total shock at what happened, I don’t know what else to say. I can’t get my head around how something like this could have happened.
“I don’t think this area will ever be the same again.”
Another resident said: “I’ve become so depressed after hearing what happened to this poor woman and her son.”
It is believed Nicola moved to Dublin from Ballina, where she was a choir singer, more than six years ago with her partner.
Nicola, who worked at Children’s Health Ireland in Crumlin, had been seen behaving erratically in the area of the M50 toll bridge at about 3.45am on Thursday.
Her body was found after she jumped from the bridge, the Irish Independent reported.
The report alleged that Nicola had been suffering from postnatal depression in recent months.
A garda spokesman said: “Gardaí are conducting an investigation into the circumstances surrounding the discovery of a body of a woman on the Lower Road, Strawberry Beds, Lucan, Co Dublin and the unexplained death of an infant boy in a house in Lucan Co, Dublin, on 22nd October 2020.
“At approximately 3.45am on 22nd October 2020, following reports of a pedestrian seen acting suspiciously at the M50 bridge, Gardaí discovered the body of a woman at Lower Road, Strawberry Beds.
“Following this incident Gardaí went to a house in Lucan where a seven-month-old baby boy was found in an unresponsive condition. He was pronounced dead at the scene a short time later.
“An incident room has be established at Lucan Garda Station and a technical examination of the scene has taken place. The Coroner and Office of the State Pathologist have been notified.
“The body of the infant has been removed to Crumlin Hospital and the body of the woman has been removed to the City Morgue where post-mortem examinations will be carried out.
“The results of post-mortem examinations will determine the course of Garda investigations.
“At this stage investigating Gardaí are treating these incidents as a family tragedy and are not currently seeking anyone else in connection with the deaths.
“No further information is available at this time. Investigations are ongoing.”