He's still listed as living in Bristol in 1930,

Name: John Valley
Home in 1930: Bristol, Hartford, Connecticut
View Map
Age: 56
Estimated Birth Year: abt 1874
Birthplace: Canada
Relation to Head of House: Lodger
Race: White
Occupation:

Education:

Military service:

Rent/home value:

Age at first marriage:

Parents' birthplace: View image
Neighbors: View others on page
Household Members: Name Age
James V Herschman 58
Menyhert A Herschman 51
Doris M Herschman
Louise A Herschman 15
Adna M Thomas 34
Joseph R Berthiaume 48
Gustine Fournier 27
John Valley 56

1920 Federal Census for Bristol, Hartford, Connecticut

Name: John Valler
[John Valley]
Home in 1920: Bristol, Hartford, Connecticut
Age: 47 years
Estimated Birth Year: abt 1873
Birthplace: Canada
Relation to Head of House: Roomer
Father's Birth Place: Canada
Mother's Birth Place: Canada
Marital Status: Divorced
Race: White
Sex: Male
Year of Immigration: 1875
Able to read: No
Able to Write: No
Image: 952

I haven't found anything for him in the 1900 or 1910 census, and nothing in death or military records. The census states he arrived around 1875-1878 so there should be something. Some of the phone directories in Bristol ue the last name spelling of "Vallee".