CSI: NY - Season 9 - Casting News - Peter Horton to Guest

When CSI: NY heads to San Francisco for an early October episode, the gang will be joined by a former thirtysomething fave. Peter Horton, who played thirtysomething's Gary, has been cast as a California-based FBI agent who once dated Jo (Sela Ward).

While visiting New York, Horton's character will reconnect with Jo and help her and Mac (Gary Sinise) with a case that concludes in the City by the Bay.

Source: TV Guide