Gina St. John

Alex's graduation causes Claire some heartache.

After a mass murder at an Internet security company, evidence indicates that the person responsible is not a typical serial killer; Prentiss is required to complete recertification training.

The hunt for a marine's murderer puts Gibbs on a collision course with an old friend, FBI agent Fornell.

After failing a military training mission, the team members are determined to prove themselves when an Internet infrastructure is threatened by a bomber.

Gibbs and the NCIS team work with a notorious private detective during an investigation of a naval officer found murdered at the bottom of a lake.

Monk tries to determine whether a baseball player is involved in a murder.