Thirty-five years later, on June 27, 1458, when Noritsuna was invited to Utsunomiya-jo Castle under the pretense of reconciliation, he was killed, whereupon the SHIONOYA family of the FUJIWARA family entered a decline (there is also a document asserting that he was killed on July 2 in Ujiie-machi, on his way back from Utsunomiya-jo Castle).
この35年後の長禄2年（1458年）5月8日、今度は教綱が、和睦を口実に宇都宮城に招かれたところを殺害され、藤姓塩谷氏は衰退する（5月13日に宇都宮城からの帰りの氏家町で討たれたと記す文献もあり）。