A fourth teenage girl has been sentenced to prison in the videotaped beating of a mentally disabled woman as she sat on her stoop in a city outside Philadelphia.

Investigators say the six teens punched and kicked the 48-year-old Chester woman and hit her with a shoe and a chair in September, apparently for fun. One recorded the beating, which was posted online.

The Delaware County Daily Times reports (http://bit.ly/Y69KXP ) 16-year-old Janyea Bell pleaded guilty to charges of conspiracy to commit aggravated assault and conspiracy to recklessly endanger another person. She's sentenced to 6 to 23 months in prison.

Bell apologized to the victim's family in court Tuesday. Two other juveniles and a 19-year-old woman have also been sentenced to prison in the case.

The remaining defendants are seeking to have their cases moved to juvenile court.

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Information from: Delaware County Daily Times, http://www.delcotimes.com