Johnson shared his diagnosis in an exclusive interview with "GMA" co-anchor Michael Strahan.
Barkan was diagnosed with ALS in 2016 and "chose to use the time he had left fighting to create a country where health care is treated as a human right."
Bryan Randall died after a three-year battle with ALS, according to a statement from his family.
A woman on Long Island is putting her resilience into action following the death of her husband to ALS.
The oral medication can be taken as a standalone therapy or with other treatments, according to the company, and it has been shown to slow disease progression.
People came together on Thursday - with a goal of finding a cure for ALS - also known as Lou Gehrig's disease.