Since then, the "Rhinestone Cowboy" singer, 78, was moved into an Alzheimer's facility full-time in April, and, according to his wife, Kim Woollen, would likely never perform or play guitar again.
In light of the news, Campbell's label has released his final studio recording, a somber ballad called "I'm Not Gonna Miss You," about the decline of his health and a farewell to his family. The accompanying video shows footage of Campbell throughout his prolific career, as well as rare and personal family footage.
Sample lyrics include the lines, "I'm still here, but yet I'm gone," and "I'm never gonna hold you like I did, or say I love you to the kids."
According to The Alzheimer's Site, Campbell is in the final stages of the disease, and receiving 24-hour care.
"There's a lot of sadness, but we just continue to make the best of every day," Woolen told PEOPLE in May.
Watch the touching video below: