Thanks for the correct info, Donna. Strangely July 18 is "online" everywhere, I think I found the date here:
http://www.findagrave.com/cgi-bin/fg.cgi...d=79761722
The site also states about his death: "At the time of his death Levi & his wife were separated & had filed for divorce. He died at the Broadway Hotel in Lexington."
I wonder how it comes that such an exact date is given (by day and month). No doubt that he couldn't have written a letter in September on the basis of this date...