J. Hayes was an officer of Earth's Military Assault Command Operations on active duty in the early to mid-22nd century. From 2153 until his death in 2154, Major Hayes was commanding officer of the MACO detachment aboard Enterprise (NX-01). (ENT: "The Xindi", "The Shipment", "Harbinger", "Hatchery", "Countdown")
Hayes was critically injured during a mission in which a contingent from Enterprise was exfiltrating Hoshi Sato, who had been abducted by Xindi-Reptilians. He later succumbed to his injuries. ("Countdown")
|Affiliation:||United Earth Starfleet|
Hayes's records showed that he was born 05 December 2102, and had an elder sister, Laura. (Reversal) His sister was an attorney, who worked with the Andorian Ambassador as a part of the peace treaty signing at the end of the Earth-Romulan War (Achieving Peace).
In the prime timeline, he was friends with Lili O'Day. When she figured out that he had gotten a cold, he swore her to secrecy. She agreed to make him chicken soup in order to make him feel better, but required that he smile on occasion as a payment (Penicillin). Upon his death, he willed her his lucky nickel, in final payment for his chicken soup debt. Malcolm Reed was given a copy of Sun Tzu's The Art of War. The remainder of his possessions, including an authentic World War III general's uniform, were given to the MACO training facility in Atlanta, and all of his personal logs were destroyed (Everybody Knows This is Nowhere).
During an alternate timeline, when the Enterprise twice went back to 2037 due to a Kovaalan particle wake, in the first instance, he wed Lili O'Day in 2052 (The Three of Us) and they had two children, Joss and Madeline.
In the second instance, he died young, and left no children (Everybody Knows This is Nowhere).
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