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Ex-Notre Dame RB George Atkinson III -- son of former Super Bowl champ George Atkinson II -- died on Monday ... less than 1 year after his twin brother committed suicide.

It's unclear how the 27-year-old passed ... but the former NFL player said losing his brother, Josh, last December took a serious toll on him.

In a letter penned by Atkinson III in October ... he said Josh's death put him "on an emotional roller coaster and in a real dark place."

Atkinson III admitted he attempted to "harm himself" shortly after the death and had to be institutionalized ... but said his 2-year-old daughter was keeping him going.

"Without my daughter," Atkinson III wrote, "I don’t know where I would be right now. She gave me that second wind of motivation."

Atkinson III was a top recruit in the country coming out of high school in 2011 ... and was a stud for Notre Dame from '11 to '13 -- scoring 10 career TDs.

He went on to play two seasons in the NFL, one for the Raiders and one for the Browns ... and scored a memorable preseason TD in 2016.

These @Raiders can flat out fly!



George Atkinson is takes this one 53 yards to the HOUSE. #OAKvsAZ https://t.co/YskT7uR7Yz — NFL (@NFL) August 13, 2016 @NFL

Atkinson III's father was a star returner and defensive back for the Raiders, making two Pro Bowls and helping Oakland win Super Bowl XI over the Minnesota Vikings.

RIP