April 24, 2010 12:00 PM

Marc Sterling/Shooting Star

Although fans of NCIS characters Special Agent Tim McGee and forensics expert Abby Sciuto often hope the pair will reconnect, actor Sean Murray couldn’t be closer to his real life partner, wife Carrie.

In fact, the Murrays just welcomed their second child — a baby boy — on Thursday.

Son River James Murray was born at 9:46 p.m. April 22 in Los Angeles, weighing in at 7 lbs., 11 oz., and measuring 20 in. long.

He joins big sister Caitlyn Melissa, who turns three next month.

“Carrie and I are pretty Zen’d out right now,” Murray, 32, tells PEOPLE exclusively. “[But we know] our 3-year-old will bring us back to reality soon enough!”

Sean and Carrie, 34, a teacher, were married in 2005.

— Cynthia Wang

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