Yes.
Howard Ronald Stuart-Houston, a Special Agent with the Criminal Investigation Division of the Internal Revenue Service, died in an automobile accident on September 14, 1989 without having had any children, leaving his brothers Alexander Adolf, Louis and Brian William as the last three members of Adolf Hitler's paternal bloodline. Howard Ronald is buried at Holy Sepulchre Cemetery in Coram, New York. It has been said that these three have vowed not to have children themselves, and none of them have married, but Alex, now a social worker, has said that he knows of no such pact, and that if it had been made, it was made by the other two brothers without his involvement.