Which German-born man was a member of the Lewis and Clark Expedition?

Private John Potts (ca. 1776-1808)
Born about 1776 in Dillenburg, Hessen, Germany.
Enlistment date: 22 July 1800; location: Winchester; term: 5 years; age: 24; height: not given;
rank: private;
hair: black; complexion: fair; eyes: black;
occupation: miller.
Expedition service from 1 January 1804 to 10 October 1806; pay-$166.66 2/3.
Killed by Blackfeet in 1808 near Three Forks, Gallatin County, Montana, at about age thirty-two.
Estate probate proceedings began 6 January 1810 in St. Louis; Rufus Easton, William Russell, and William Massy executors; File 69.
No known marriages or children.