Former NFL star Chris Johnson says he's been diagnosed with ALS

'Fox & Friends' co-host Brian Kilmeade traveled to Green's home in New York to discuss his diagnosis, faith, technology allowing him to use his own voice, fundraising for a cure and new book 'Rocket Arm.'

Chris Johnson was a dominant running back at one point in his NFL career.

He ran for 2,000 yards in his second season with the Tennessee Titans in 2009 on his way to three consecutive Pro Bowl appearances. He was named the 2009 Offensive Player of the Year and made the Pro Bowl in 2009 thanks to his statistical prowess that season.

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Tennessee Titans running back Chris Johnson stands on the sidelines during the fourth quarter against the Houston Texans at Reliant Stadium in Houston, Texas, on Nov. 28, 2010. The Texans defeated the Titans 20-0. (Brett Davis/USA TODAY Sports)

Johnson, 40, on Monday announced a new and harrowing battle. He said he was diagnosed with ALS.

"T here's no history of ALS in my family," he said on ABC’s "Good Morning America." "My doctors believe my case is what's called sporadic ALS, which is actually how the vast majority of ALS cases happen.

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"That's one of the reasons this disease can be so shocking. It can happen to someone who never expected it."

Tennessee Titans running back Chris Johnson breaks free for a long run against the San Francisco 49ers in the fourth quarter at Candlestick Park in San Francisco, Calif., on Nov. 8, 2009. The Titans defeated the 49ers 34-27. (Cary Edmondson/USA TODAY Sports)

Johnson said he started to notice a weakness in his right hand and that his grip hadn’t been as strong as it