It looks like it got scrubbed. You may be able to find it in the archive or way back machine. I think it was in the Lincoln or Afton, Wyoming newspaper (where he is supposedly from). You can also check the Cheyenne newspaper because I think that is where the current Cheney house is located. Also, maybe dig around here in case somebody let it slip into the geneology record and didn't fix it: https://ldsgenealogy.com/WY/Lincoln-County-Newspapers-and-Obituaries.htm ; The date of it was around Powell's death date.