Catherine Nevin, dubbed the Black Widow, died in a care facility in Dublin on Monday night at the age of 67.
Nevin, who became known throughout the land as the "Black Widow" after a sensational trial 17 years ago, protested her innocence to the end.
Tom Nevin was killed during a staged robbery at their pub, Jack White's Inn, near Brittas Bay in Co Wicklow in the early hours of 19 March 1996.
Photographs of Nevin's arrival to court were prohibited, as was comment on her hair, dress, jewellery, nail varnish, reading material or demeanour.
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In September, the infamous murderer was granted full-time temporary release from prison due to an inoperable brain tumour. All three declined her offers at the time - in 1989 and 1990 - but gave evidence against her during the trial years later.
It detailed how she regularly flaunted her lovers in the pub in front of her husband and she even furiously ordered him to knock before entering her bedroom after he found her in bed with another man.
She was charged with murder in April 1997 and found guilty in August 2000 after a 42-day trial. In 2010, she also lost an application to have her conviction declared a miscarriage of justice.