Mike Guenther
From Super-wiki
John Winchester co-owned a garage in Lawrence with Mike Guenther until his departure following Mary's Death.
John, Dean and Sam lived temporarily with Mike and his wife, Kate, following the destruction of their home. (See The Journal (diary entries).)
Sam and Dean pose as police officers investigating the unclosed case of John's 'disappearance' in 1.09 Home in order to speak to Mike.
