His wife, Dana, tells TMZ ... Keith passed away Tuesday in his home in Keithville, Louisiana after he discovered that he had the disease in January. Dana said it was unclear what type of cancer he had.

His presence will definitely be missed. Keith was beloved by his fellow contestants from the "Survivor" franchise, whose producers isolate a group of strangers on an island where they compete in endurance challenges to avoid elimination through voting until one person is left victorious.

Keith and his son, Wes, appeared on 2014's "Survivor: San Juan del Sur," where Keith reached the final four competition before getting the boot. The following year, Keith returned to an alternate version of the show — Survivor: Cambodia — where he nearly made it to the finals again, but he got voted off.

Some of Keith's fellow contestants paid homage to him on social media.

Jeremy Collins, who won "Survivor: Cambodia" in 2015, tweeted his condolences to Keith's family, noting that he and Keith were both firefighters by trade.

Ex-contestant Kelley Wentworth recalled that Keith had the "purest heart" and a good sense of humor when everyone really needed some laughs.

ET was first to report his death.

Keith was 62.