Antonacci was an engineer serving aboard the USS Lexington under chief engineer Lieutenant Commander Rachel Mithra.

In 2374, during a battle in the Setlik system during the Dominion War, Antonacci was severely injured, but was able to be stabilized by Dr. Elizabeth Lense. (SCE eBook: War Stories, Book 1)

USS Lexington personnel
USS Lexington (NCC-1709)	J. Baila • Berriman • P. Coss • D.W. Davidson • Garth of Izar • Ito • T. Ivari • L. Kelso • R. Leslie • W.C. Perinal • M. Rousseau • W. Samuels • D. Sinclair • L. Sterling • C. Stuart • N. Uhura • D. Watley • R. Wesley
USS Lexington (NCC-14427)	Declan Keogh • Manojlovich • Rosita Pérez
USS Lexington (NCC-61832)	T. Allenby • H. Anderson • Antonacci • Audrey • G. Ben Zoma • Bowdren • T. Cadwallader • S. Carson • Cavanaugh • J. Cox • Eberling • Fornnel • Gaines • F. Galloway • Griscom • Halprin • Hasegawa • G. Jenson • P. Joseph • Kumagai • Leff • E. Lense • R. Mithra • Moytulix • Pridemore • Rodgers • Soriano • J. Turner • Twistekey • Man-Fai Wan • Wilhoite
USS Lexington (Steamrunner-class)	A. Jago