A University of South Carolina student is facing felony charges after hidden cameras allegedly caught her poisoning her roommates' food. 

Hayley King, 22, is shown in the video spitting on food in the refrigerator and then appears to put window cleaner into the food.

King later confessed and she now faces charges of unlawful, malicious tampering with a human drug product or food.

The felony charge carries a maximum sentence of up to 20 years in prison. 

Her two roommates had set up the camera in their off-campus apartment in February. 

The roommates had reportedly been in previous altercations with King and were concerned over what she might do.