Ezra Hinckley [h. Abigail D.], June 2, 1849, a. 32 y. 7 m., "on his way to California." GR3.
from
Vital Records
of
Duxbury
Massachusetts.
***
Ezra Hinckley
Birth: 25 Nov 1817 - Barnstable, Barnstable, MA

BTW: This Ezra left a wife and I think four children.

additional information courtesy of greyfox in the forums.

**
Publication: Barnstable Patriot; Date: Aug 1, 1849; Section: None; Page: 3
At Port Kearney, Pawnee Territory,June 2nd , of cholera , Mr Ezra Hinckley,son of Mr Isaac Hinckley,of this town.

additional information courtesy of RJensen in the forums.

**
There were two Ezra Hinckleys so this information may apply:
Here is a family group sheet listing the children mentioned. Perhaps more than you wish for; but there seems to be a fair amount of chatter about him. Also it is interesting that he may not be burried there as some evidence shows he may not have died in 1849 but did make it to California.
Name: Ezra HINCKLEY
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Birth: 25 Nov 1817 Barnstable, MA
Death: 2 Jun 1849 Ft. Kearny, going to Ca
Father: Isaac HINCKLEY (1792-1850)
Mother: Caroline HUCKENS (1796-1817)
Spouse: Abigail CHANDLER
----------------------------------------
Birth: 28 Jun 1816 Duxbury, MA
Death: 2 Jul 1858 Duxbury, MA
Father: Isaac CHANDLER (1784-)
Mother: Abigail DELANO (1787-)

Children:
----------------------------------------
1 F: Abbie Marie HINCKLEY
Birth: 13 Sep 1841 Boston, MA
Death: 6 Nov 1841 Boston, MA
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2 M: Ezra Freeman HINCKLEY
Birth: 3 Dec 1842 Boston, MA
Spouse: Martha E. GERALD
Marriage: 1 Oct 1876
Spouse: Eliza J.
Marriage: 1886 England
----------------------------------------
3 F: Caroline Huckins HINCKLEY
Birth: 1 May 1845 Boston, MA
Death: bef 1880
Spouse: Harrison G. FREEMAN
Marriage: 1 May 1868
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4 F: Eveline Elizabeth HINCKLEY
Birth: 24 Jan 1847 Charlestown, Suffolk, MA
Spouse: George W. CURTIS
Marriage: 23 Dec 1867
----------------------------------------
5 M: James Francis HINCKLEY
Birth: 30 Mar 1849 Charlestown, Suffolk, MA
Death: 2 Dec 1897
Spouse: Lucretia S. HIRTH
Marriage: 13 Aug 1873

additional information courtesy of a visitor to Findagrave.