8:49 AM PT -- Tarik says he's devastated over the loss of his brother ... writing on social media Monday morning, "I lost my brother, my twin, myself."
"What a great man he was," the Bears RB continued. "I’m glad i got to express just how much i love him while he was here. God truly calls home the best and most worthy. I’ll just miss him forever."
Tyrell Cohen -- the twin brother of NFL running back Tarik Cohen -- was found dead Sunday ... after officials say they believe he was electrocuted trying to climb power equipment.
Authorities say the 25-year-old, who's a fraternal twin of the Chicago Bears star, was involved in the tragedy shortly after a single-car crash Saturday morning in Raleigh, NC.
Officials say Tyrell left the scene of the accident after the wreck ... and could not be located in the ensuing hours.
Tyrell's family eventually filed a missing person report Saturday night ... with Tarik even putting out a message on social media asking anyone in the area for help locating his brother.
"Could be on foot in the [woods] around 540 and six forks," Tarik said in a since-deleted tweet. "Possibly injured!"
Officials say on Sunday morning, they resumed their search for Tyrell ... and, after an employee at a Duke Energy substation discovered a body, officials ultimately identified it as Tyrell's.
BREAKING🚨: Body found today off Lead Mine Road at a @DukeEnergy substation in Wake County. Sheriffs office says the man was electrocuted trying to climb equipment. It’s believed the man was trying to get away from law enforcement. No identity yet. #ABC11pic.twitter.com/836COuJMcR