After several years of dating, Killam and Canadian actress Cobie Smulders became engaged in January 2009.[19] They married on September 8, 2012, in Solvang, California.[20] The couple have two daughters. The first, Shaelyn Cado Killam, was born May 16, 2009;[21] the second, whose name was not revealed, was born in January 2015.[22][23][24]