Mark Duper is the latest ex-NFL star to test positive for signs of CTE-- chronic traumatic encephalopathy--the former Miami Dolphin confirmed to CBS Sports Friday night.

The 54-year-old former wideout, a three-time Pro Bowler, underwent a battery of tests for two days at UCLA two weeks ago, which revealed he has some mild cognitive impairment. Duper said he learned of the diagnosis Friday afternoon. "It is what it is," said Duper, who less than two years ago beat kidney cancer.

"I'm thinking back on my life and where I am going with this. I have to deal with it and make the best of it. It does make me think of the future and how things are gonna change."

Duper is the fourth former NFL star this week to be diagnosed with signs of CTE . On Wednesday, doctors revealed that Pro Football Hall of Famers Tony Dorsett and Joe DeLamielleure, along with former All-Pro defensive lineman Leonard Marshall, have been diagnosed as having signs of CTE, according to an ESPN report. CTE is a condition caused by head trauma, and is linked to dementia and depression.

These tests for CTE on living former players called PET scans are potential game-changers in the world of neuroscience, according to neurosurgeon Dr. Julian Bailes, a former team physician for West Virginia University and for the Pittsburgh Steelers.