Killian had been a sole practitioner at William C. Killian, Attorney at Law, P.C., from 1979 to 2010. He also served as a City Attorney for the town of Monteagle from 1981 to 1988, and from 1996 to 2010; and as an Assistant District Attorney for the 12th Judicial District of Tennessee from 1976 to 1979, and from 1988 to 1990. From 1979 to 1980, he was an adjunct professor at both Edmondson Junior College and the Northeast State Junior College.[1]
United States Attorney
On May 20, 2010 Killian was nominated by President Barack Obama to be the United States Attorney for the Eastern District of Tennessee.[2] He was reported favorably by the United States Senate Committee on the Judiciary on September 23, 2010. He was confirmed by the full United States Senate by voice vote on September 29, 2010.[3] He was sworn into office on October 4, 2010.[4] Killian prosecuted a case on the basis of "public safety concerns" in which a convict, Edward Young, touched shotgun shells while helping a recently-widowed neighbor sort through her deceased husband's belongings; Young was subsequently sentenced to a mandatory minimum of fifteen years in federal prison.[5] On November 19, 2015, Killian resigned from office to rejoin private practice.[6]