According to a senior law enforcement source, the shooter was Frederick Hopkins, a 74-year-old Vietnam War veteran and disbarred attorney who is known to law enforcement as an accomplished marksmen.
The shooting suspect surrendered Wednesday evening after talking with a negotiator, Chief Deputy Glenn Kirby of the Florence County Sheriff's Office told CNN affiliate WBTW.
The search warrant was based on an allegation that a 27-year-old person at the home sexually assaulted a foster child, he said. One of the officers, Terrence Carraway, a 30-year veteran of the force, died from his injuries. His condition is not now known, she reported. "The way the suspect was positioned, his view of fire was several hundred yards so he had an advantage and the officers couldn't get to the ones that were down".
Florence County Sheriff Kenny Boone said officers responded to the call unaware of the firepower waiting inside the house. The two officers who've been released are getting counseling, as are other members of his agency.
Local police chief Allen Heidler described the fallen officer as "the bravest police officer that I have ever known" and asked people pray for the six who were injured.
Hopkins was charged in 2014 with disorderly conduct, online court records show.
Ordinarily, investigations of shootings involving SC law enforcement officers are handled by the S.C. State Law Enforcement Division (SLED).
The suspect was taken into custody and the children weren't hurt after a two-hour standoff in an upscale neighborhood just outside of Florence, not far from areas that were devastated by flooding from Hurricane Florence, authorities said.
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Officers from all over arrived to help and the suspect ultimately shot four Florence city police officers, one fatally, Mr Heidler said.
Authorities said Fred Hopkins is under arrest in a hospital after falling on his head at some point during the Wednesday standoff. They were taken to a nearby hospital for treatment.
The man shot three Florence County deputies from inside a home as they came to serve a warrant around 4 p.m. Wednesday, Nunn said.
"I have been shooting competitively since 1984 and lovin" it. "They will be scarred for a long period of time", he said.
Carraway "was a giant of a man, but he was the proverbial gentle giant, and I loved him", the police chief said.
Florence Mayor Stephen Wukela said Carraway had "the ability to bring the sense of order and peacefulness to the most hard of situations". He was critically wounded when a mortar round exploded near him, the letter said. A candlelight vigil was held Thursday night at First Baptist Church in Florence. CBS News correspondent David Begnaud joined CBSN from Florence, South Carolina, with the latest. "We owe our deepest gratitude to law enforcement officers who stand on the front lines every day protecting our families and communities", he added.
"This is simply devastating news from Florence", Gov. Henry McMaster said on social media.
President Donald Trump tweeted his "thoughts and prayers", saying "We are forever grateful for what our Law Enforcement Officers do 24/7/365".