Stingray is a member of the SHIELD Super-Agent team. He utilizes a cybernetic weapon-equipped dive suit to operate in the ocean. He’s had some encounters with Namor the Sub-Mariner in his principle role as the Security Director for the SHEILD deep ocean research facility known as Hydrobase.
Stingray was at Hydrobase when it was attacked and badly damaged by Hydra, and he is missing and presumed captured. (Assembly Required #2)