I'd say he left them in the corridor outside the Officers' Quarters, and quite deliberately.
She'd know the top officers would not be spending much time there, being extremely busy with other things. OTOH, she had already tried to implicate the top officers in the assassination cabal, by hiding the uniforms in a location only accessible to top officers (the dining room); that's apparently where Scotty is taking Kirk and Spock when the door swooshes open and the corpses are revealed. Valeris probably killed them on Kirk's very doorstep in another desperate attempt to tarnish Kirk beyond doubt.
Plus, it was a nice and secluded place for a clandestine meeting with the two goons. Easier to kill them there than just about anywhere else.
Of course, by implicating top officers, Valeris was also implicating herself. But that didn't matter much in the big scheme of things: she was out to sling mud at Kirk for use in Klingon propaganda, not to convince Kirk's friends of the Captain's guilt or her own innocence. And Spock would already have known anyway that there had to be top officer involvement in something as big as this, if not for any other reason then because restricted-access records had been tampered with. Valeris knew she was on a suicide mission with the clock ticking against her. (Not literally, tho - she had no intention of sacrificing her life for the cause, as evidenced by her failure to go out in a blaze of glory when the obvious "Now hear this" trap drove her to a corner.)
Timo Saloniemi
She'd know the top officers would not be spending much time there, being extremely busy with other things. OTOH, she had already tried to implicate the top officers in the assassination cabal, by hiding the uniforms in a location only accessible to top officers (the dining room); that's apparently where Scotty is taking Kirk and Spock when the door swooshes open and the corpses are revealed. Valeris probably killed them on Kirk's very doorstep in another desperate attempt to tarnish Kirk beyond doubt.
Plus, it was a nice and secluded place for a clandestine meeting with the two goons. Easier to kill them there than just about anywhere else.
Of course, by implicating top officers, Valeris was also implicating herself. But that didn't matter much in the big scheme of things: she was out to sling mud at Kirk for use in Klingon propaganda, not to convince Kirk's friends of the Captain's guilt or her own innocence. And Spock would already have known anyway that there had to be top officer involvement in something as big as this, if not for any other reason then because restricted-access records had been tampered with. Valeris knew she was on a suicide mission with the clock ticking against her. (Not literally, tho - she had no intention of sacrificing her life for the cause, as evidenced by her failure to go out in a blaze of glory when the obvious "Now hear this" trap drove her to a corner.)
Timo Saloniemi