William Collingwood from Newcastle Upon Tyne to USA 1850 and his family

[hivebiz65]

William and Dorothy Collingwood and several unmarried brothers and sisters, widowed mother, a married brother, and all the kids came over to NY July 1850 on Ship Constellation.  I have assembled quite a bit on these folks but still have questions.  Maybe someone has info?
William was born 1801 to Ralph and Elizabeth.  Married Dorothy Oliver 1834. US in 1850.
Eventually my branch arrrived in Dodgeville, WI about 1860.
Dorothy is buried at East Side Cemetery in Dodgeville very oddly apart from everyone. But nowhere can I find William or his obituary or a death record.  I've been to the courthouse many times, searched many databases.
I wonder where and when William died - from the census he was alive in 1870.  Nothing after that.  And where is he buried?  I already found another 3great grandfather who "runned off" with the maid so I imagine there is something hiding out there.  Otherwise my great-aunt would have recorded him in the records.

[Milliepede]

When did Dorothy pass away and was she a wife or a widow at the time? 

Have you checked out his children to see if he went to live with one of them 

[hivebiz65]

She was a widow - I think.  I now know better than accept without fact
I will run down the kids now.  I had not done that.  Thank you!

[Milliepede]

Did she die in 1882?  If so Find A Grave website has an image of the headstone and can't read it but the page says - inscription says wife of Wm Collingwood aged 71 yrs, 1 mo

[hivebiz65]

That is my memorial on Find a Grave.