SYRACUSE -- A woman already charged with killing one of her husbands and suspected of killing another was accused Thursday of trying to kill her 20-year-old daughter with a toxic cocktail laced with drugs.

After giving her daughter the tainted drink, Stacey Castor then typed out a note to make the poisoning look like a suicide, a note that included a purported confession by her daughter to the murder of the two men, said Onondaga County District Attorney William Fitzpatrick.

Fitzpatrick said the daughter, Ashley Wallace, has been completely cooperative with his office and denied having any connection with the poisonings.

Castor, 40, of Liverpool, has been held without bail since her arrest Sept. 14 for the murder of David Castor, 48, in August 2005. Police said David Castor was poisoned with ethylene glycol, a toxic chemical found in antifreeze.

She is also a suspect in the death of her first husband, 38-year-old Michael Wallace of Weedsport. Wallace's death in January 2000 was originally attributed to natural causes. But his body recently was exhumed after David Castor died and Wallace's death was ruled a homicide due to ingesting ethylene glycol.

On Thursday, she was arraigned in Clay Town Court on a charge of second-degree attempted murder in the case of Ashley Wallace.