As the governor's appointed state resident trustee, he was in charge of deaf, dumb and blind asylum's construction and continued as a trustee of the asylum from 1858 to 1873. He was elected as mayor of the City of Flint in 1870 serving a single 1-year term. The first pavement on Saginaw Street was laid during his term as Mayor.
Post-Political life
In 1872, Walker was the first president and director of the Genesee Savings Bank. Walker died in Flint, 1877.