After speaking with CNN as well as Acevedo and Swack, Martin Vogel began thinking more about his uncle.

CNN: After 63 years, vet learns of brother's death in Nazi slave camp

"He actually murdered several GIs -- no question about it, " Swack said.

CNN: After 63 years, vet learns of brother's death in Nazi slave camp

At times, Martin Vogel wept during the phone conversation with Swack.

CNN: After 63 years, vet learns of brother's death in Nazi slave camp