Stanley Wilson Jr. -- a former Detroit Lions cornerback and the son of ex-Bengals running back Stanley Wilson Sr. -- has died after collapsing at a mental hospital earlier this month ... TMZ Sports has learned.
Wilson Jr. had been in police custody following his vandalism arrest back in August ... but according to prosecutors, he was declared incompetent to stand trial and was transferred from county jail to the Metropolitan State Hospital in Los Angeles County on Feb. 1.
But, law enforcement sources tell us during intake at the medical facility -- which specializes in caring for those with mental health issues -- he collapsed and died.