WOODBURY, N.J. (AP) — A southern New Jersey woman who authorities said poisoned her grandmother with antifreeze was charged with murder Thursday after the 88-year-old woman was taken off life support.
The Gloucester County Prosecutor's Office said 88-year-old Mary Groatman was pronounced dead Thursday afternoon at Underwood-Memorial Hospital in Woodbury, four days after the alleged poisoning.
Anna Castagna of Brooklawn, who initially was charged with attempted murder and aggravated assault, was charged with murder, Gloucester County Prosecutor Sean Dalton said. She was being held on $250,000 bail.
Dalton said Groatman was poisoned Aug. 19 while she was living at a rehabilitation center in Deptford.
Groatman was Castagna's grandmother by marriage. Castagna's husband has not been named in the investigation.
Dalton told The Gloucester County Times (http://bit.ly/PFzl4O) that investigators discovered that Castagna had researched the effects of antifreeze on humans in the days leading up to the alleged poisoning. He said Groatman was otherwise in good health and had lived with Castagna and her husband for a decade.
Authorities haven't said what prompted the alleged poisoning or how Castagna allegedly administered the antifreeze.
Copyright 2012 The Associated Press.