The 36-year-old quarterback who spent most of his career with the Tennessee Titans was shot to death July 4, 2009, by his mistress, 20-year-old Sahel Kazemi, who then killed herself.
Vincent Hill, a former Nashville police officer, has said there should be a new investigation and requested that a three-member team from the Davidson County grand jury review his complaint.
In its final report filed Friday, the panel said Hill "lacked evidence to support his views."
Hill has disputed investigators' findings in McNair's death and wrote a book presenting his own theory of the crime.
However, Nashville police spokesman Don Aaron recently told The Associated Press that the current investigation should stand.