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It's called auto-vampirism,
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essentially becoming his own first victim.
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It's the way by which he first tasted human blood.
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Most vampirists are incredibly ashamed of this
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And will wear long-sleeved shirts in order to conceal it.
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Secondly, there will be a long history of animal abuse,
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Starting with smaller animals such as insects and rodents
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And then working his way up to larger things--
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Dogs and cats.
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Though this is a well-recognized component
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Of the homicidal triad seen in other serial killers,
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In the case of the vampirist, it's more pronounced.