NEW : The gunman apologized as he lay dying , a medic and witness says . Police : Brian Bachmann was the gunman who killed four and injured two . He was fatally shot by police in Texas , Texas . Among the victims was Thomas Caffall , a highly regarded law enforcement officer .
NEW : The gunman apologized as he lay dying , a medic and witness says . Police : Thomas Caffall was the gunman who killed two and injured four . He was fatally shot by police in College Station , Texas . Among the victims was Brian Bachmann , a highly regarded law enforcement officer .