Sorry, I don't have access to obituaries but this may help you.
Google "Cemetery Record Search" +"South Dakota State Historical Society."
There are fifteen MARTEL burials in Bethany Cem., Hosmer, Edmunds Co., SD. In Lot 62 are Fred, 1945; Elizabeth, 1937; & Emil, 1955.
Google Pilot.FamilySearch.org. Cleveland Twp., McPherson Co., SD, 1900, MARTEL
Friedrich, b. Jan. 1871, imm. 1889; wf. Elisabeth, b. June 1877, imm. 1885, they & parents b. Russia, married 6 y.; 4 ch., 4 living.
B. SD: Gustaf Aug., Aug. '95; Christine, Nov. '96; Karl A., Nov. '97; Emil R., Feb. 1900.
In 1910, same, with addition of Otto A., 7; Anna M., 6; Richard F., 4; & Ida K., 3.
SD Births: Friedrich MARTEL & Elisabeth HENNE[Y] had Gustave, 12 Aug. 1895; Christina, 15 Oct. '96; Carl, 20 Nov '97; Emil, 21 Feb. 1900; Otto, 18 Nov. '01; Richard, 6 Sep. '05; Eda, 15 Nov. '06; & __, 27 Jan. '10.
They were still in McPherson Co. in 1920, but of Edmunds Co., 1930. On a current map, there is a Cleveland Twp. in Edmunds County and some unorganized areas called West McPherson & Central McPherson to the north. Somebody with a map showing Township 125 - 71 may help you locate Friedrich.
Google BLM +"land patents." Friedrich patented, 21 July 1900, in McPherson Co., Twp., 125 N, Range 71 W of 5 PM, Section 13, west half of NW quarter & Sec. 14, north half of NE quarter. Also in Twp. 125-71: August , Fred, & Georg MARTEL.
RootsWeb Family Trees: Friedrich MARTEL, b. 1 Feb. 1871, Kassel, Gebiet Glückstal, Odessa, Russia, son of Adam MARTEL & Christina ALEXANDER, m. 6 Feb. 1862, Glückstal.
Pilot.FamilySearch.org has (an earlier) Adam MARTEL (1791, Kefenach - 15 Nov. 1840, Glücksthal).
It appears that Friedrich is the proper spelling, but the name was also found as Friedrick & Fred.
Contact the Germans from Russia Heritage Society in Bismarck, ND, for more information.