Glen Campbell received a diagnosis of Alzheimer's disease in 2011 after a diagnosis of general cognitive decline in 2009. As of 2015, the last song the country singer recorded after the diagnosis was "I'm Not Gonna Miss You." The song won a Grammy Award for Best Country Song in 2015.
Due to cognitive decline as a result of the Alzheimer's disease, Campbell was unable to recall what it meant to win a Grammy at the time of his song's win. He was not present at the award ceremony, but his wife Kim expressed her plans to place the award in his hands in hopes that it triggered him to remember the significance of a Grammy Award.
Released in October 2014, a documentary called "Glen Campbell: I'll Be Me" included footage from Campbell's final tour. The goal of the documentary was to spread awareness about the reality of Alzheimer's disease.
In a February 2015 interview, Campbell's wife described the state of her husband's condition, explaining he was largely unable to communicate but could still utter short but meaningful phrases, such as "We are so blessed" or "I love you." She stated that he had a cheerful demeanor most of the time but could become extremely agitated.