This might be him :-

1881
Sarah Shermer abt 1820 Wyesome, Monmouth, Wales Head Westbury On Severn - East Dean, Gloucestershire
William Shermer abt 1852 Cinderford, Gloucestershire, England Son Westbury On Severn - East Dean, Gloucestershire
Elijah Shermer abt 1853 Cinderford, Gloucestershire, England Son Westbury On Severn - East Dean,

Name: Samuel Shermer
Estimated birth year: abt 1821
Year of Registration: 1875
Quarter of Registration: Jul-Aug-Sep
Age at Death: 54
District: Westbury On Severn
County: Gloucestershire
Volume: 6a
Page: 156

1871 Cinderford
Samuel Sherman 49 Cheltenham
Sarah Sherman 50
William Sherman 21
Elizah Sherman 19
Benjamin Herbert 40

1861
Samuel Sherman abt 1822 N Crime Prisn North Hamlet, Gloucestershire

1861
Sarah Sherman abt 1821 Devon, Monmouthshire, Wales Head East Dean, Gloucestershire
William Sherman abt 1843 Chettisham, Gloucestershire, England Son East Dean, Gloucestershire
Elijah Sherman abt 1851 Devon, Monmouthshire, Wales Daughter East Dean, Gloucestershire

possible
1851
Saml T Shortman abt 1778 Bristol Head Newnham, Gloucestershire Clock and watchmaker
Samuel Shortman abt 1816 Newnham, Gloucestershire, England Son Newnham, Gloucestershire
William Shortman abt 1819 Newnham, Gloucestershire, England Son Newnham, Gloucestershire
Harriett Shortman abt 1823 Newnham, Gloucestershire, England Daughter Newnham, Gloucestershire
Emma J Shortman abt 1841 Newnham, Gloucestershire, England Granddaughter Newnham, Gloucestershire

1841
Saml Shorman abt 1781 Newnham, Gloucestershire
Elizabeth Shorman abt 1817 Gloucestershire, England Newnham, Gloucestershire
Samuel Shorman abt 1821 Gloucestershire, England Newnham, Gloucestershire
William Shorman abt 1821 Gloucestershire, England Newnham, Gloucestershire
Harriett Shorman abt 1825 Gloucestershire, England Newnham, Gloucestershire

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Ἀριστοτέλης A Gloster & Hereford Boy in the Forest of Dean ><((((*>

You will find a transcribed copy of the Inquest on this Web site with the spelling of his surname as SHERMER.
http://www.forest-of-dean.net/inquests/

Verdict (Cause of death)

Crushed by the fall of a bridge, which the deceased with other was engaged in taking down near the Iron Works, Cinderford

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Possibly more details may be in a local newspaper report.