Neither of her former husbands testified at the trial, but both have strongly denied the allegations.

Ms. Jordan, a former nurse from Manhattan who became an entrepreneur and made more than $50 million with home health care companies, testified she received death threats from her first ex-husband in the days preceding her son’s death, after she confronted him about money transfers out of their accounts.

Two years earlier, she testified, Jude had informed her that his father — her second husband — had repeatedly sodomized and tortured him. She said her son first described the abuse with a few partial words and gestures, but then, in a breakthrough three months later, learned to type on a laptop and gave a detailed account, naming several other people as well.

Ms. Jordan’s lawyer, Allan L. Brenner, contended the threats from her first husband, coupled with her fear that her son would again be abused, caused an emotional maelstrom. She saw a murder-suicide as the only path out of their predicament, he said. “She did it because she loved Jude,” Mr. Brenner told jurors in his summation last week.

But prosecutors presented evidence suggesting the killing of Jude was not a spur-of-the-moment act. She testified she had thought about the crime for days before she carried it out. She had not seen either of her former husbands for months, and both men had relinquished their parental rights to Jude.

She also betrayed no outward signs of emotional turmoil. Hotel employees testified that Ms. Jordan coolly gave instructions to mail donations to two charities, and she paid a manager $1,000 cash for an extra night at the hotel even after she had poisoned her son. And while he lay dying, she made arrangements via email with a financial manager to cover outstanding bills, the evidence showed.

The police found Jude in a bed at the Peninsula around noon on Feb. 5, 2010. The door had been barricaded with a chair. Ms. Jordan was on the floor next to the bed, surrounded by pills. A pill crusher and a syringe used to force-feed patients were discovered, along with empty vodka bottles.