He has been an Associate Justice on the Supreme Court since June 1993 .
Sylvester Umaru Onu ( born June 15 , 1938 ) is a Nigerian judge .
Sylvester Umaru Onu has been an judge   on the Supreme Court since June 1993 .
Sylvester Umaru Onu ( born June 15 , 1938 ) is a Nigerian judge .