In the first of a two-part report on "The Early Show" Monday, CBS News Chief Investigative Correspondent Armen Keteyian had spotlighted some possibly faulty police conclusions.
The new revelations from police consisted of a 14-page case summary of their handling of the case. It provided some fresh details, including text messages between McNair and his 20-year-old girlfriend hours before the sexy young waitress allegedly shot him.
One message reflects a request for $2,000 from McNair to help pay her bills; others suggest she was stressed out and could hardly breathe, over money issues. Hours later, McNair transferred the money into her account.
But, Keteyian says in his second report, which aired on "The Early Show" Tuesday, CBS News has uncovered records of cell and text messages the Nashville police haven't made public.
Authorities have maintained from the start that Sahel "Jenni" Kazemi shot McNair, a 36-year-old married father of four who was almost a year-and-a-half into retirement, four times with a 9 mm pistol in the early morning hours of July 4 at a Nashville condo he rented with a friend before, police say, turning the gun on herself.
Police say she purchased the murder weapon from 33-year-old Adrian Gilliam Jr., a convicted felon who spent nine years in prison for second degree murder and attempted armed robbery. Gilliam told police he sold Kazemi the gun for $100, in a parking lot, two days before the deaths.
On July 8, Nashville Police Chief Ronal Serpas told reporters, "They transacted the deal ... and that, pretty much, is where that ends."
But gun powder residue tests on Kazemi's hands were inconclusive, and CBS News has learned there is little or no evidence on the gun sale -- just Gilliam's word.
So, Keteyian tracked Gilliam down to a Tennessee jail, where he's being held on federal gun charges related to the case.
In an exclusive interview -- no cameras were allowed -- Gilliam told Keteyian he sold Kazemi the gun on Friday, July 3, not Thursday, as police first said he did. Gilliam insisted to Keteyian that he barely knew Kazemi and couldn't even remember her name or how they met, describing a fleeting sort of relationship the U.S. attorney in Nashville, Edward Yarbrough, and Serpas portrayed as fact during a July 17 news conference.
"A casual exchange between two people," is how Yarbrough put it.
"He hardly knows who he's dealing with and yet he's selling a gun," Serpas said. " ... How they came together is probably happenstance."