police have not disclosed his identity and family do not know who he is , but a police report confirmed the man was detained with scott and put in the back of a police car .
the 33-year-old patrolman has been charged with murder after 50-year-old walter scott was gunned down last saturday in north charleston , south carolina .
it has also been revealed that the officer was allowed to stay with the force , despite being the subject of a complaint that alleged he used excessive force on an unarmed man .