Freezer works fine, but only half of refrigerator works, other half is frozen w/ ice

The freezer portion of the appliance works fine and is fully functional. The refrigerator half of the appliance does not work right. Half of the fridge is frozen with ice, the other half is warm.

I hardly know anything about appliances, but I am sure this could be a quick diagnosis for someone who knows what they are talking about.

Any help would be appreciated.