In the book Murder Machine it says that Roy DeMeo was killed at one of Patty Testa's garages by Nino Gaggi, and also by Joey Testa and Anthony Senter.
However, in the more recent (2008) biography of Casso, he states that Roy was killed at Patty Testa's house in Flatlands, and that he was killed by Testa and Senter themselves as he was about to receive a cup of coffee. It says that Nino Gaggi wasn't even there during it. However, he almost certainly ordered Senter and Testa to do the hit.
Which is correct? Murder Machine or Casso's biography? (Which do you think?)