R.E. Creech m.12/30/1891 Cooke Co., TX, to Belle Moore. His name was Richard Eli Creech. East Hill Cemetery in Pontotoc Co., OK, shows: R.E. Creech, Nov. 4, 1871 - Nov. 25, 1915. There are a lot of Ada, OK, newspapers online with Creeches mentioned many times in community columns, and including one with Mandy Belle Moore's obit in 1953. No papers yet for Eli Creech's death date but you might be able to get an obit by writing to the public library in Ada.
Eli was the son of Jesse A. Creech and Margaret Caroline "Mollie" ___. Years ago there was some question about whether her maiden name was Rose or Smith. You can find the family on the 1880 Cooke Co., TX, census.
Then going backwards, look for Jesse A. Creech on the 1860 census of Monroe Twp, Lincoln, MO, son of James Creech and Margaret J. Rybolt. Jesse was in Shannon Co., MO, on the 1870 census and in 1900 in the Chickasaw Nation, Indian Terr'y. In 1910 Margaret was in Tillman Co., OK.
The best person I know to help you with the Missouri families from the Lincoln County area is Roy Juch, if he's still active. If not, his database might still be online. I haven't had contact with him for years but google the name.
I am not related, just have an old collection of "stuff" from the Creech newsletter days.