BMX legend Dave Mirra may have suffered from CTE -- just like several ex-NFL players -- and it may have been a factor in his suicide ... so says the Mayor of Greenville, NC.
Mayor Allen Thomas says officials are still gathering the facts surrounding Mirra's death -- but says he fears he may have had CTE from head trauama suffered during his extreme sports days.
Thomas even invoked the name of ex-NFL star Junior Seau -- who took his own life in 2012 ... and was later found to have the brain condition.
Police chief Mark Holtzman says investigators have spoken with a group of Mirra's friends -- who Mirra was with minutes before the suicide -- and they said Dave didn't appear suicidal.