The nanny convicted of child abuse in the death of an infant has been sentenced.Judge Mark Ashford handed down a 70-year sentence for Sarah Cullen, 25, on Monday morning.Cullen was found guilty in March of intentional child abuse resulting in death in connection with the 2013 death of 4-month-old Cash Bell.-- Video: Woman convicted in baby's death sentenced to 70 yearsAccording to a police interview, Cullen gave different accounts of how the baby was injured. She eventually said she slipped, causing the baby to fall down the stairs.She said the baby wasn't crying, but he was lying on the floor with clenched fists. Cullen said she panicked, held him and he fell asleep. Cullen said it wasn't until later that Bell began exhibiting signs that he was severely injured.Cullen's ex-boyfriend also testified Cullen called him and said Bell wasn't breathing. He said he went the house, called 911 and took them to the hospital. He claims Cullen never mentioned what happened.Bell died from severe skull fractures a few days later.Prosecutors said Cullen's failure to act after Bell's fall and her multiple versions of what happened showed her lack of credibility.Cullen will get 413 days credit for time served.The state said the sentence handed down Monday was appropriate."She's responsible. She's been held responsible, and now she's going to have to pay that penalty by the time she's going to have to do,” said Douglas County Attorney Don Kleine.Even though Cullen will serve time behind bars, Kleine said the harsh reality of the situation is that the sentence, no matter how long, will never bring Bell back.

The nanny convicted of child abuse in the death of an infant has been sentenced.

Judge Mark Ashford handed down a 70-year sentence for Sarah Cullen, 25, on Monday morning.

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Cullen was found guilty in March of intentional child abuse resulting in death in connection with the 2013 death of 4-month-old Cash Bell.

-- Video: Woman convicted in baby's death sentenced to 70 years

According to a police interview, Cullen gave different accounts of how the baby was injured. She eventually said she slipped, causing the baby to fall down the stairs.

She said the baby wasn't crying, but he was lying on the floor with clenched fists. Cullen said she panicked, held him and he fell asleep. Cullen said it wasn't until later that Bell began exhibiting signs that he was severely injured.

Cullen's ex-boyfriend also testified Cullen called him and said Bell wasn't breathing. He said he went the house, called 911 and took them to the hospital. He claims Cullen never mentioned what happened.

Bell died from severe skull fractures a few days later.

Prosecutors said Cullen's failure to act after Bell's fall and her multiple versions of what happened showed her lack of credibility.

Cullen will get 413 days credit for time served.

The state said the sentence handed down Monday was appropriate.

"She's responsible. She's been held responsible, and now she's going to have to pay that penalty by the time she's going to have to do,” said Douglas County Attorney Don Kleine.

Even though Cullen will serve time behind bars, Kleine said the harsh reality of the situation is that the sentence, no matter how long, will never bring Bell back.