As of January 14, 2016 the DD-WRT website only lists two firmware versions for the router, and neither of the downloads has the name kill associated with them.
http://download1.dd-wrt.com/dd-wrtv...rt1200ac/ddwrt-linksys-wrt1200ac-webflash.bin
http://download1.dd-wrt.com/dd-wrtv...rt1200ac/ddwrt-linksys-wrt1200ac-webflash.bin