In court last week, a judge said he needed more time to decide if the former cop should be released on bond.
“I’m not a flight risk to the community or a danger,” Slager said in court last week, explaining that he would follow the rules of house arrest and would like to see his infant son.
Slager's attorney, Andy Savage, said his client was "discouraged and depressed" in jail.
"We share Michael's disappointment in today's Court decision but remain firmly convinced that following a review of all the evidence, a jury of Michael's peers will find that he was free of any criminal intent in his actions on April 4, 2015," Savage said in a statement.
Slager is in isolation for his own protection because he is in jeopardy from other inmates as a former cop, his lawyer told ABC News, and so he only has one hour a day to walk around freely.
He "gets out for one hour between 2 and 5 a.m. each day. He is locked up the other 23 hours a day," Savage said.
Slager faces a possible 30 years to life without parole if convicted.