Kira has always been told that beasts killed her father. When Kira tells Jamison that Annabella says there are no beasts, he replies, “Shes very old. Its dangerous for her to speak that way.

In context, Annabella is deviating from the script..... what everyone is supposed to believe. From the text, we can infer that Jamison is responsible for Annabella's death. While he may not have killed her himself.... he likely repeated what she said to those who needed to silence her.