The first fatality of the Oxcart program occurred on 5 January 1967, when "Article 125" crashed, killing CIA pilot Walter Ray when the aircraft ran out of fuel while on its descent to the test site. No precise cause could be established for the loss and it was considered most probable that a fuel gauging error led to fuel starvation and engine flameout from the base. Ray ejected successfully but was unable to separate from the seat and was killed on impact.