officer michael slager is being held at charleston county jail .
his 8-months pregnant wife jamie and mom karen visited him on friday .
housed in housed in a room with one small window and does not have any interaction with any other detainees at charleston county jail .
slager , 33 , is charged with murder after opening fire on walter scott , 50 , after reportedly stopping him over a broken tail light in north charleston .
dashcam footage shows scott running from his car after being pulled over .
minutes later slager shot him in the back in a nearby park .