How many slaveowners in the United States were killed by their slaves?

While you are waiting for answers, you might want to check out some previous threads on slave rebellions in the Southern US:

Were there any slave rebellions in pre-civil war United States? Did black slaves ever have their Spartacus? - 9 comments, over 10 months old.
The comments in this thread talk about the number of slave rebellions which occurred in the US and their implications for the slave owners.
Was there ever a Spartacus style slave rebellion in the American South? - 3 comments, over 1 year old.
This succinct thread gives some context for the various barriers to rebellion for slaves lived with up to the American Civil War.
Why was the antebellum South so afraid of a possible slave rebellions? - 3 comments, over 3 months old.
This thread goes into what caused American slave owners to tighten restrictions on their slaves as they went later and later into the Antebellum period.
Why didn't the American Slaves revolt en masse? - 21 comments, over 1 year old.
Many scholars on American slavery and several sources are brought to the forefront to describe theories for this lack of large scale rebellion and their criticisms.