Snape is a powerful wizard, who is capable of casting spells non-verbally. And, we know that even complex spells like Avada Kedavra can be cast non-verbally. Using non-verbal magic should have been second nature to Snape.
However, when Snape cast Avada Kedavra on Dumbledore, he did speak the name of the spell. Is there any reason why chose to cast a verbal spell here, when we would normally expect him not to?
Shouldn't the act of casting verbally have alerted the Death Eaters that something was up, possibly to his wish not to kill Dumbledore?
Answer
Generally speaking, when casting a difficult spell, verbal casting is to be preferred unless there is a specific reason to avoid it. Non-verbal casting increases the risk of the spell failing.
The only reason Snape might have wanted to use non-verbal casting when killing Dumbledore is if the Death Eaters might criticize or be suspicious of him for failing to do so. But Voldemort cast Avada Kedavra verbally when attacking Harry in Order of the Phoenix. From a Death Eaters point of view, if it's good enough for Voldemort, it's surely good enough for Snape.
Also, if he had cast the spell non-verbally it might have left doubt as to what spell he had actually cast; it could have been nothing but a spell for green light, after all. This way, the Death Eaters know for certain that Snape really did kill Dumbledore. That was pretty effective at diverting suspicion. :-)
[Out of universe, both Snape's and Voldemort's choice to cast Avada Kedavra verbally is presumably to avoid any confusion or doubt on the reader's part.]
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