Question

I'm looking for Kathryn Elmira McCoy born 23 sept 1880 married George Thomas Beck 26 May1899.

Comments

It would help if you included any location - COUNTRY - region/state/province - city, town for birth, marriage, death etc.  that you know of.
Any children?

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Might be this woman, off by one day?  Mother's last name is difficult to determine.
From familysearch.org:

https://familysearch.org/search/records/index#count=20&query=%2Bgivenname%3Akathyrn~%20%2Bsurname%3Amccoy~%20%2Bbirth_place%3AOH~%20%2Bbirth_year%3A1880-1880

Katherine Mccoy  
Birth  24 Sep 1880 Green township, Scioto, OH
Father  Patrick Mccoy
Mother  Mary Ann Sleuifs ? Shiefs
Informant: Mary Ann McCoy

Also there is:
Cora Patrick Mc Coy Male
Birth  20 Sep 1869  Green, Scioto, Ohio
Father: Patrick Mc Coy
Mother: Mary Ann Shimp

Answer 1

Familysearch.org (FS) has the following information available 

Kathryn Elmira Elizabeth McCoy FS ID MWXX-SKW born 23 September 1880 Wells, Elko, Nevada, United States – died 25 October 1956 Pendleton, Umatilla, Oregon, United States 

Spouse George Thomas Beck FS ID MPFM-4M8 born 26 October 1872 Nebraska, United States – died 16 June 1923 San Diego, California, United States

 

They had 2 children 1 male & 1 female

 

I suggest you go to Familysearch.org to check ALL the information that is available

 

NOTE: I am passing this on for your information – I can only be guided by what is on that site, correct or not

 

Cheers Ross Geissmann