Later, a more skillful and refined Slaymaster has been hired by Vixen (a British villain and old enemy of Captain Britain) to kill all of the members of S.T.R.I.K.E.'s psi-division, including Captain Britain's sister, before her planned infiltration of the intelligence's facility.
In their final meeting, Braddock's sister Betsy (soon to be Psylocke of the X-Men) had assumed the mantle of Captain Britain (Brian had 'retired').