Crown attorney Diane McGrath says the case involving Melissa Ann Weeks will return to provincial court Tuesday in Sydney, N.S.
The 77-year-old Weeks has also been charged with administering a noxious substance to her husband, who fell ill at a bed and breakfast in Sydney last weekend.
Weeks was convicted of manslaughter in 1992 in the death of a previous husband who she drugged and ran over twice with a car.
She also has convictions for fraud and forgery involving men she had relationships with before recently marrying Fred Weeks in New Glasgow, N.S.
Weeks was sentenced in 2005 to five years in prison on seven counts of theft from a man in Florida she had met online.