The original chief medical officer of the Kelvin-timeline USS Enterprise, killed in Nero's first attack at Vulcan in the 2009 film Star Trek, leaving Leonard McCoy to take his place.
Dr Puri is chief medical officer of the newly launched USS Enterprise in the alternate reality of 2258. He is mentioned in the 2009 film Star Trek but is not seen.
When the Enterprise arrives at Vulcan and comes under fire from Nero's ship Narada, a hit on deck six kills him. McCoy, a cadet rushed aboard as a medical officer, reports the death to the bridge.
Spock, in command while Pike is aboard the Narada, replies that McCoy has therefore inherited the post. The battlefield promotion is how McCoy becomes the ship's chief medical officer in this timeline, a position he keeps for the rest of the film series.