FBI trying to determine who owns letter written by Jackie Kennedy in 1968 . Letter passed from collector to collector , but widow says she gave it to no one . Comment: Son Thomas Nuckols told authorities he found it among the papers left by his father .
FBI trying to determine who owns letter written by Jackie Kennedy in 1968 . Letter passed from collector to collector , but widow says she gave it to no one . Letter found among papers of Russell Nuckols , who died in 1999 , son says . Son Thomas Nuckols told authorities he found it among the papers left by his father .