According to “With Porter in North Missouri” by Joseph A. Mudd, pages 68-69; 244; 298:
The 11th MSM Cav (Union) captured Major Owen on June 8, 1862 and shot him.

The book is viewable at:

http://digital.library.umsystem.edu/cgi/t/text/pageviewer-idx?c=umlib;cc=umlib;sid=459e6f835c40da2c82149eee6ea0dd00;q1=mudd;rgn=author;view=image;seq=1;idno=umlc000048

You might have to copy n’ paste or go to:

http://digital.library.umsystem.edu/

and do some searching for Joseph A. Mudd