Highlights from the Nineth Episode of Season 10 of NCIS

Gibbs (Mark Harmon, right - center) teams up with FBI Agent Fornell (Joe Spano, right) on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, (Melinda McGraw, left) gets involved. Also pictured: Cote de Pablo Photo: Monty Brinton/CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs (Mark Harmon, center) teams up with FBI Agent Fornell (Joe Spano, left) on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, (Melinda McGraw, left) gets involved. Also pictured: Cote de Pablo Photo: Monty Brinton/CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs teams up with FBI Agent Fornell on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, (Melinda McGraw, left) gets involved. Also pictured: Cote de Pablo Photo: Monty Brinton/CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs teams up with FBI Agent Fornell on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, gets involved. Pictured: Michael Weatherly Photo: Monty Brinton/CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs teams up with FBI Agent Fornell on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, (Melinda McGraw) gets involved. Photo: Monty Brinton/CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs teams up with FBI Agent Fornell on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, (Melinda McGraw, left) gets involved. Also pictured: Michael Weatherly Photo: Monty Brinton/CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs teams up with FBI Agent Fornell on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, gets involved. Pictured: Sean Murray (left) and Pauley Perrette Photo: Cliff Lipson/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs teams up with FBI Agent Fornell on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, gets involved. Pictured: Pauley Perrette Photo: Cliff Lipson/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs teams up with FBI Agent Fornell on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, gets involved. Pictured: Pauley Perrette Photo: Cliff Lipson/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs (Mark Harmon, second from right) teams up with FBI Agent Fornell (Joe Spano, right) on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, gets involved. Also pictured: Sean Murray (left) and Pauley Perrette Photo: Cliff Lipson/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Gibbs teams up with FBI Agent Fornell on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, gets involved. Pictured: Pauley Perrette Photo: Monty Brinton/CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.