Goodwin, David Marcus

Homeopathic physician located in Phoenix. Began homeopathic practice in 1857. [http://www.homeoint.org/history/king/1-40.htm]
King, William Harvey. History of homoeopathy and its institutions in America. 1905.
Quebbeman, Frances E. Medicine in territorial Arizona. Phoenix : Arizona Historical Foundation, 1966, page 343.

J Am Med Assoc, Oct 1908; LI: 1180: David M. Goodwin, M.D. Dartmouth Medical School. Hanover. N. H., 1856; for forty-five years a practitioner of Minneapolis: assistant surgeon of the Third Vermont Volunteer Infantry: and later brigade surgeon in the Civil War; died at his home in Los Angeles. September 14. from heart disease, aged 74.

Most likely a different person, but the timing is an interesting coincidence:
J Am Med Assoc. 1908;LI(14):1179: David M. GOODWIN, M.D., to Miss Catherine A. King, both of Los Angeles, Cal., September 11.
Master pnID
AMH-PN1336
Src1 DP
AHSL-DP
Residence(s)
Phoenix