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Maybe rogue, with all Knowledge skills (or at least all the appropriate ones), Improved Unarmed Strike, and the Combat Expertise feat tree, especially Improved and Greater Feint. He is sneak attacking with those RDJr type blows.
In the movies when Holmes does his "Holmesvision" I'm thinking the Martial Artist's ...
Pain Points (Ex): At 3rd level, a martial artist's advanced knowledge of humanoid anatomy grants a +1 bonus on critical hit confirmation rolls and increases the DC of his stunning fist and quivering palm by 1. This ability replaces still mind.
Exploit Weakness (Ex): At 4th level, as a swift action, a martial artist can observe a creature or object to find its weak point by making a Wisdom check and adding his monk level against a DC of 10 + the object's hardness or the target's CR. If the check succeeds, the martial artist gains a +2 bonus on attack rolls until the end of his turn, and any attacks he makes until the end of his turn ignore the creature or object's DR or hardness.
A martial artist may instead use this ability as a swift action to analyze the movements and expressions of one creature within 30 feet, granting a bonus on Sense Motive checks and Reflex saves and a dodge bonus to AC against that opponent equal to 1/2 his monk level until the start of his next turn.
This ability replaces ki pool.
... both also seem to fit a RDJr style Holmes doing a stunning blow followed up by a few finishers or defending himself.