Season 4
The fourth season of NCIS made its debut on September 19, 2006. The season opener was named as Shalom.  It was a very well received episode of the season and it received 13.80 million viewers. The last episode of the season was named as Angel of Death. It was aired on May 22, 2007 and received 14.14 million viewers. It followed the success trend set by the previous seasons of the show.
NCIS Season 4 consisted of the following episodes:
- Shalom
- Escaped
- Singled Out
- Faking It
- Dead and Unburied
- Witch Hunt
- Sandblast
- Once a Hero
- Twisted Sister
- Smoked
- Driven
- Suspicion
- Sharif Returns
- Blowback
- Friends and Lovers
- Dead Man Walking
- Skeletons
- Iceman
- Grace Period
- Cover Story
- Brothers In Arms
- In The Dark
- Trojan Horse
- Angel of Death