The Cape Breton Regional Police declined to confirm the reports, but said they had a 77-year-old woman in custody who they believe matches the identity of a woman with a past criminal history of fraud and manslaughter charges.
The reports say the woman arrested is Melissa Ann Friedrich, also known as Millie Weeks.
The woman was sentenced in 2005 to five years in prison on seven counts of theft from a man in Florida she had met online.
Investigators in that case said she stole about US$20,000 from Alexander Strategos.
In 2001, she was convicted of manslaughter in the death of her husband, Gordon Stewart, who she had drugged and run over twice with a car in 1991 outside Halifax.
She served two years of a six-year sentence for that crime.
The Cape Breton police said Monday they arrested a woman following an investigation into the health of a 75-year-old New Glasgow, N.S., man who was admitted to the North Sydney General Hospital.
Officers were called to the hospital on Sunday after suspicions were raised about the nature of the man's illness.
Police say a warrant was later issued for arrest of the man's wife and a search of her home in New Glasgow.
Cheryl Chambers, the operator of a bed and breakfast in North Sydney, said a couple named Fred and Millie Weeks checked in early Friday morning.
Chambers said Millie Weeks told her they had travelled to Cape Breton from Newfoundland on the ferry.
Chambers said on Saturday morning, Millie came downstairs alone and said her husband wasn't well.
She said paramedics later arrived and took her husband to a hospital.
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