Casey Kasem His Mind Is Gone 
 
 EXCLUSIVE 
 
 is in terrible shape ... his mind is almost gone and he's unable to function -- this according to new legal docs obtained by TMZ.The document outlines the mental state of the legendary founder of "America's Top 40" radio program.
– Iconic DJ Casey Kasem, who left show business in 2009 at age 77, has just months to live, according to legal documents obtained by TMZ. Kasem and wife Jean were sued by a former caregiver who says Jean mistreated her, and the case was heard (and thrown out) yesterday. A rep who appeared on Jean's behalf revealed Kasem is dying, according to TMZ. Jean herself submitted legal documents that say Kasem "is terminally ill and unable to leave home." TMZ has obtained other legal documents regarding Kasem this month; his kids say stepmom Jean has blocked them from seeing their father, and they're fighting her. Among the revelations: Kasem has advanced Parkinson's disease; may have early dementia and can only "shuffle short distances"; and suffers hallucinations and major impairment to his memory and ability to communicate, among other things.