I hate to admit it but it's true. I thought it was just an error but it's true. Here's what JEFusion said about the death of Tatsuya Nomi:
A very sad day has come to past for all Super Sentai fans specially that of Gosei Sentai Dairanger as Tatsuya Nomi, who portrayed the role of Daigo/Shishiranger has passed away at the age of 47 last May 18, 2017.
The news came from a tweet from Tatsuya's brother and was confirmed by our friend, Sir Danny Torres with blog translations from Filip. No other information has been handed out yet as to the what was the reason of his death. Updates will be posted after.
Tatsuya was born in August 13, 1969. Years after Dairanger ended, he returned to the tokusatsu scene as a guest in Ninpuu Sentai Hurricanger as Sanpei Hamada, one of Shurikenger's human disguise, and in Go Go Sentai Boukenger Task 37 where he played the role of the Wakabayashi manager.
We at JEFusion sends our deepest condolences and prayers to the family and close friends …