David Caruso & Girlfriend Expecting Second Child

By Cynthia Wang

Wednesday March 28, 2007 07:10 PM EDT

David Caruso with Liza Marquez

Jon Kopaloff/FilmMagic

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CSI: Miami star David Caruso and girlfriend Liza Marquez are expecting their second child together, his manager tells PEOPLE.

Caruso, 51, and Marquez are the parents of 18-month-old Marquez Anthony. Caruso also has a 22-year-old daughter, Greta, from his second marriage to actress Rachel Ticotin.

Caruso split from his third wife, Margaret Buckley, in 2005.