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Could not find William, but found his wife:

NEEDRITH-Elizabeth J., of Bay Shore, L.I., on December 21, 2002. Beloved wife of

the late William J. Needrith. Loving mother of xxxx(3 childrens names) . Cherished grandma of 6. Dear sister of xxx(Brothers name). Reposing at The Fredrick J. Chapey & Sons East Islip Funeral Home, 200

East Main Street ( mile west of the S.S. Pkwy., Exit 45W). Religious Service at the

Funeral Home, Monday, 12:30 PM. Interment, Holy Rood Cemetery, Westbury, L.I.

Visiting, Sunday, 2-4:30 and 7-9:30 PM, and Monday, 10 AM - 12:30 PM.



Perhaps you can post a request on findagrave to obtain a photo of the headstone, which would narrow down his date of death. 

The Municipal Archives of NYC has them http://www.nyc.gov/html/records/html/archives/holdings.shtml

I believe Albany (the State Capital) has them as well, but if ordering copies or sending someone to look up for you, the best place would be NYC Archives. 

There is a marriage (& births to 1909) database at either italiangen.org or at germangenealogygroup.com that are searchable.   If you are looking for actual copies of the documents, they aren't available online. 

Familysearch.org has "some" NYC marriage records available - https://familysearch.org/search/collection/1680847

and some births here - https://familysearch.org/search/collection/1680842

There is a newspaper article for the marriage of William C Werder & Christiana which can be found on genealogy bank, however I do not have a subscription.

Date:Saturday, December 9, 1905
Location:Jersey City, New Jersey
Paper:Jersey Journal
Article type:Newspaper Article

From the preview I can see, it says
...... Avenue, Hudson City, was united in marriage to Mr. William C Werder of 354 Hoboken Avenue on Wednesday evening November twenty-second at the parsonage of the....... 
 

Hmmmm…..have you gotten a copy of  the eldest Joseph’s DC yet? 
Dickers Joseph E 60 y Dec 29 1919 33865 Manhattan  (born abt 1859) 

You may already have seen this, but didn't want to lose it in case you hadn't:
WEDNESDAY, DECEMBER 31, 1919 New York Herald
TWO OLD EMPLOYEES IN SURROGATES' OFFICE DEAD
Within a few hours, two employees of  the Surrogates' office, who had been in
the city's service for more than a quarter of a century and were particular cronies,
have passed away. Joseph E. Dickers, a clerk in the recording department, living at No. 166 East Eighty-third street, was stricken with heart disease while on his Way  home  o n Monday night and died in  a n  elevated tram before the arrival of a Physician.

Also found:
Daniel E Dickers, son of Joseph E,  248 East 84th Street died on May 14th, 1903
Catherine Sutton Dickers, November 30, 1931 (no husband listed), mother of Frank, Walter, Fred, Helen & Joseph
Are either of these pertinent to your Dickers line?