Well 4chan is saying that the shooter's name is John Earnest and his manifesto is a Pastebin file posted at April 27, 2019, 12:10:12 CDT. I don't know if this info is true yet or just a prank on /pol/.
15:34 - 27 Aib 2019
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Tá moill ar an lódáil, is cosúil.
Tá Twitter ag cur thar maoil le gníomhaíocht nó tá fadhb eile ann. Bain triail eile as nó tabhair cuairt ar Stádas Twitter chun tuilleadh eolais a fháil.