Officials say Phuong Le, of Suisun City, was stabbed in the chest.
Le's body was found nearly six weeks ago near Lake Berryessa in rural Napa County.
No arrests have been made in the case.
Anyone with information about the case is asked to call the Fairfield Police Department at (707) 644-7867 or Crimestoppers at (707) 428-7600.
