A St. Clair Shores nurse accused of killing and dismembering her adult son has been found guilty, the jury rejecting her testimony that a masked armed man killed him and kept her hostage for five days.

A Macomb County jury on Monday found Donna Scrivo, 61, guilty of first-degree murder, disinterment and mutilation of a body.

Scrivo filed a missing person's report in January 2014, telling authorities Ramsay Scrivo, 32, left their St. Clair Shores home and failed to return. Five bags containing Ramsay's body parts were dumped in early 2014 in St. Clair County, about 50 miles northeast of Detroit, according to authorities. An electric saw was also in one of the bags.

According to prosecutors, Donna Scrivo drugged her son, strangled him and dumped his body in a bathtub. Police believe he was strangled on Jan. 25, 2014, the day before his mother reported him missing.

In closing arguments Monday, Assistant Prosecutor William Cataldo called Scrivo's account "fake."

"You either believe that … or you believe the physical evidence," Cataldo said.

Defense lawyer Mark Haddad pointed out that none of Ramsay Scrivo's DNA was found on his mother. Haddad also said his 110-pound client couldn't lift the body of her 235-pound son into a bathtub and asked what reason she would have for killing and mutilating him.

"She would have to be the stupidest murderer in the world unless she was forced," Haddad said. "Unless she was directed at gunpoint to do these seemingly stupid things."

As the last witness in her defense, Donna Scrivo testified she found the armed man in her son's room and he made her help him, including carrying the bags with her son's remains out of the home and driving them to St. Clair County.

"I'm not mother of the year. I have multiple problems," Scrivo said. "I think I did everything to protect the rest of my family. I did everything he told me to."

First-degree murder carries a mandatory penalty of life in prison without possibility of parole under Michigan law. Judge Richard Caretti set her sentencing for June 23.

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The Associated Press contributed.

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