Mon, May 14, 2012 11:04 AM EDT

On Friday, a Florida judge charged Marissa Alexander with three counts of aggravated assault and sentenced her to 20 years in prison for firing a "warning shot" in front of her abusive ex-husband. No one was hurt in the incident but because of a controversial Florida law the 31-year old woman is now facing a mandatory 20-years in prison.

Her attorneys wanted a new trial based on Florida's Stand Your Ground law but the Judge presiding the case disagreed.