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NEOSHO, Mo. (AP) - A 34-year-old southwest Missouri woman has been sentenced to four years in prison after pleading guilty in the methadone overdose death of her 22-month-old son.

Elizabeth Farnam, of Granby, pleaded guilty in September to second-degree involuntary manslaughter in the June 2012 death of Logan Crow.

A toxicology report showed the toddler died from an overdose of methadone, which is prescribed mainly to treat heroin addiction. Investigators said Farnam had obtained the drug illegally.

Farnam told police at the time that she dropped a methadone pill while Logan was sitting on her lap during a church meeting. The toddler began sweating profusely on the drive home and was put down for an afternoon nap, but wasn't checked until the next morning.

KOAM-TV reports Farnam was sentenced Monday in Newton County.

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Information from: The Joplin (Mo.) Globe, http://www.joplinglobe.com

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