Duarte was an engineer who served aboard Deep Space 9 in the 2370s.
In early 2373, Duarte was as "sick as a vole" (in Whatley's words) and Rom was asked to take their place on the swing shift. (DS9: "The Assignment")
According to the script, Duarte's name was pronounced as "DWART-ay". 
Duarte's gender was unknown, as the individual was never referred to by a pronoun.