The 79 year old widow was found dead in her home by fire services – who were called to a blaze on Wolfe Tone street in the town – almost 30 years ago.
Gardaí in Kilkenny arrested a man last night and charged him with her murder.
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Ms Smyth's death is understood to be one of those examined in recent years by the Garda cold case unit.
The man is due to appear at a special sitting of Kilkenny District court this morning.
