hit head on chair when he fell at previous bail hearing in los angeles .
knight , a diabetic with blood clot , said he had n't received any medication .
lawyer said chains and wheelchair were a ` ploy ' to ` humiliate ' his client .
cle ` bone ' sloan was hurt and terry carter died in the alleged hit-and-run .
knight , 49 , charged with murder and attempted murder for january incident .