His final major task was as a member of a committee set up to investigate the cause of the explosion on the space shuttle Challenger on Tuesday 28 January 1986.
Kanyang huling mga pangunahing gawain ay bilang isang kasapi ng isang komite-set up upang siyasatin ang sanhi ng pagsabog sa sasakyang nagdududa sa Martes, 28 Enero 1986.