McNair had multiple wounds, along with the believed fatal wound to the head.
It is believed to be part of a double homicide and more information will be given as soon as possible.
A woman was found dead as well along with McNair, identity released by police as Sahel Kazemi.
Kazemi and McNair were described by police as friends and Kazemi's Cadillac is also listed in McNair's name.
A witness saw McNair enter his home around 1:30 A.M. on July 4th.
Steve McNair was 36.