When was the US 1000 dollar bill discontinued?

The last printing of $500, $1000, $5,000 and $10,000 bills was in 1945, but they carried the series date 1934.

Production was discontinued due to low demand. At that time even a $100 bill represented a very large amount of money for most people. The Treasury didn't recall any high-denomination bills though, so those that were in circulation remained available and it was possible to request them through most banks. By the 1960s organized crime was using them as a convenient way to move large sums without being readily detected. In July of 1969 President Nixon issued a directive that banks could no longer distribute any bills larger than $100 and in addition they had to hold any that were deposited.