I'm sorry this took so long to obtain. I believe that this is your guy based on the address that is the same as that for Josie and children in the 1900 census. This is how the record reads from the copy I printed off microfilm housed at the Milwaukee Public Library (Central Location).

Volume 146--Page 458
Book of Deaths for Milwaukee County, Wisconsin

Frank Labenski
White
Male
47 years old
Laborer
Born: Poland
Wife: Josi Labenski
Date of birth: September --1850
Date of death: March 26--1897
Cause: Pneumonia
Place of death: 805 Garden, Milwaukee, Wis.
Burial Ground: Polish Union Cem.
Attending physician: Carl Wagner of 486 Mitchell st