McMillon models for such retailers as the GAP in his spare time, which has earned him the nickname "Runway" with his teammates.[6] He also appeared on an episode of Teammates on ESPN with teammate Brian Urlacher.[7]
In June 2013, McMillon was told by his doctor that he had prostate cancer, and stated, "When he told me I was positive for cancer, I just went numb. I thought he had the wrong test. I played in the NFL. I am super healthy. I work out all the time, so I am in really good shape. I was like, 'This can't be me. I'm only 39 and I have prostate cancer?'" In August, McMillon had his prostate removed, which had contained the disease.[8]