On 13 October 1969, the infamous Z, Sent to the San Francisco Chronicle for a change in their usual follies
Watching the month and the day
10 and 13
As periodic table correspond to neon and aluminum, which are represented by "Ne and Al"
Becoming an "almost" anagram of the name of one of the suspects (ALLEN), add to this the fact that it has been observed by others, the renewal of the same driver's license was also on that date (in 1967)