Though McNair was a married father of four, he was seeing Kazemi and at least one other woman, police said.
Earlier in the day, Kazemi texted McNair, saying she was stressed and needed money to pay bills.
"Baby I might have a break down im so stressed," Kazemi said in one text message. "baby i might need to go to the hospital. baby whats wrong w(ith) me i can hardly breath(e)."
Chris Wall, who provided security for McNair and his family, told police he knew about McNair's relationship with Kazemi. McNair was tired of her calling when he was with his family, Wall said.
Kazemi continued to text McNair throughout the day, asking for money and when she could see him next.
"baby what are u doing," Kazemi asked.
"At the pool with the kids. I got the guy transferring the money," McNair replied.
At 4:04 p.m. on July 3, Kazemi said, "baby I have to be w(ith) u 2nite. I dnt care where." The messages continued for more than eight hours before McNair said he was on his way to the condo. He had told Kazemi earlier that he wouldn't leave the house "til the kids fall asleep."
McNair and Kazemi exchanged a final series of messages early July 4, when he asked her to leave the front door to the condo open for him.
A final message, sent at 1:14 a.m., simply said, "its open."
More here: Investigation reveals final hours of McNair, girlfriend - CNN.com