Second-degree murder is usually defined as a killing that is either not premeditated or is caused by reckless conduct with a lack of concern for human life. Second-degree murders are different from voluntary manslaughter, where the killing is committed in the heat of passion. It’s also different from first-degree murder, which involves premeditation. There are three common situations considered second-degree murder:
SECTION 16-3-10. “Murder” defined. “Murder” is the killing of any person with malice aforethought, either express or implied.
SECTION 16-3-50. Manslaughter. A person convicted of manslaughter, or the unlawful killing of another without malice, express or implied, must be imprisoned not more than thirty years or less than two years.
http://www.scstatehouse.gov/code/t16c003.php
South Carolina does not differentiate between degrees of murder. It's either murder or it isn't. There is no first degree or second degree.