Found this at a Columbia SC news station website, so may not have been a second shooter:
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Tuesday, April 30
3:02 a.m.: CMPD identifies the suspect as 39-year-old Terry Clark Hughes, Jr. The agency said Hughes was wanted on multiple warrants from Lincoln County and confirmed he was killed during the standoff.
8:33 a.m.: Jennings tells Fox News he cannot confirm there were two shooters, which was previously reported by law enforcement. Jennings said it’s possible that Hughes was moving throughout the house, creating the illusion of multiple gunmen.
Thanks!