I never heard that Laura bush had killed a boyfriend. It has to be an urban legend. If it were true itwould have come out when Geoorge bush was running for president at the same time all the flack was out about his military record.
I am not sure about that, but there was pages and pages of it on the internet, when he was running for president, but I never heard anyone really discuss the incidient. It happened when she was a teenager.