He has always been very careful with his words to me, so it is likely important.

That is one possibility, yes, although, the only one that I can confidently call murder would be the first. It is possible that the third was a related accident. I do not feel there is enough information to say.

Although, now I am curious about the order of their death. Which was the murder, and is there any way we could figure that out from the information we have?