A letter she had written before her death incriminated him as the murderer if she were to die eventually ; the letter led to his prosecution .
In 2002 , a man had been convicted of murdering his wife by antifreeze in 1998 .
A letter wife had written before wife 's death incriminated him as the murderer if she were to die eventually ; the letter led to his prosecution .
In 2002 , a man had been convicted of murdering his wife by antifreeze in 1998 .