Mike Duffy Retires After Career Tainted by Senate Expenses Scandal

Sen. Mike Duffy makes his way to the Senate on Parliament Hill in Ottawa, Canada, on May 28, 2013. The Canadian Press/Fred Chartrand

OTTAWA—Sen. Mike Duffy is stepping down after more than a dozen years in the upper house, where the Senate expenses scandal overshadowed the bulk of his parliamentary career.

Duffy turns 75 on Thursday, making today his last one as a senator due to mandatory retirement rules.