He is the reason that Parker's death was so appealing to me. Ever since Parker told him to go get Jones, I loathed Parker for taking advantage of Brett's good nature. Sure, there was some redemption when Parker rescued Ripley from Ash but Brett was, by far, my favorite character and so I never completely forgave Parker.
RIP Harry.
"You still with us, Brett?" will take on a whole new meaning next time I see you in Alien.