Catherine Starr was the wife of Elihas Starr and the mother of Ava Starr. Catherine assisted her husband in recreating the Quantum Tunnel. However, they were suddenly killed by an explosion when the Tunnel malfunctioned.
Quantum Tunnel Explosion
Following Elihas Starr's dismissal from S.H.I.E.L.D., Catherine and their daughter, Ava, moved with Elihas to Argentina. In order to clear his name, Elihas decided to recreate the Quantum Tunnel that he was designing with Hank Pym and Bill Foster, and Catherine agreed to assist him, as a renowned scientist. However, experimentation suddenly went wrong and Tunnel was ready to explode. Catherine tried to get Ava away from the Tunnel, but Ava ran in the opposite direction back towards her father and the Tunnel. Catherine reached her just as the tunnel exploded. Catherine and Elihas instantly died while Ava survived, but her molecular condition was broken.