WAUKEGAN, Ill. (CBS) — A 25-year-old woman was sentenced to 31 years in prison on Thursday for the murder of a 16-month-old boy, who she allegedly tossed to the ground three years ago.

Melissa Calusinski was convicted last year of first-degree murder and aggravated battery. A jury found her guilty of throwing Benjamin Kingan of Deerfield onto a tile floor, causing fatal brain trauma.

Lake County Judge Daniel Shanes sentenced Calusinski to 31 years in prison during a hearing on Thursday.

LISTEN: WBBM Newsradio’s Bob Roberts reports

Benjamin’s death profoundly affected his family, his mother, Amy, said Thursday as her husband, Andy, sat beside her holding her hand.

“There’s no way to comprehend what Melissa has done to us. We will never recover from what she did,” Amy Kingan said.

The Carpentersville woman faced a possible life sentence, but Shanes instead opted for the prison term.

Before he did, Calusinski once again denied she hurt the boy.

“I want everyone to know I am innocent of this crime. I did not abuse or hurt him in any way,” she said. “I will never stop fighting this. And I will always maintain my innocence.”

Calusinski told police in two videotaped statements she became frustrated and threw Benjamin down when he fussed as she tried to wash his hands after he’d eaten an afternoon snack of animal crackers and fruit juice. She told investigators she saw him crawl to a bouncy seat, then found him unconscious a few minutes later.

Defense attorneys argued during her trial that police coerced those statements from Calusinski after hours of intense questioning. She repeated that claim Thursday at her sentencing.

“My statements were false, but I had no choice to admit those things,” she said. “I was so scared, I did not understand what the detectives were telling me to say.”

Her attorneys contended Calusinski never harmed the boy, but said Benjamin had prior, undiagnosed brain bleeding that could have been abruptly aggravated by even a minor head injury — a view backed by two pathologists who testified on her behalf.

Defense attorney Paul DeLuca argued Benjamin could have exacerbated his condition by throwing himself down during temper tantrums, including at least one he had on the day he died.

Prosecutor Christen Bishop dismissed such claims, telling jurors the boy was a “healthy, happy toddler” before he died, not a “ticking time bomb” who died while in Calusinski’s care.

His mother Thursday mourned a life cut short.

“He had so much life ahead of him, and she took that away from him and us,” she said. “We wish so badly we could hold him in our arms one last time.”

(The Sun-Times Media Wire contributed to this report.)

Watch & Listen LIVE