His first appearance on the show was meant to help Gibbs regain his memory after Gibbs experienced amnesia.
Afterward, Gibbs joined the unit underneath Franks' supervision, learning everything about investigations from the older man.
So what happened to Mike Franks on “NCIS”?

The killer then fatally stabbed Franks with a scalpel, leaving Gibbs to discover his mentor’s lifeless body.
The team later attended Franks' funeral, during which he was buried with full military honors.
