Were you followed?Ara
Shadow of Chernobyl
He appears as an assassination target in the Deal with the snitch job given by Lukash. In order to complete this quest, Marked One must first follow Pavlik to the abandoned farmstead and wait for the go to kill Pavlik then wait for Ara. If Pavlik is killed before the go is given, the mission will be a failure. He also appears at the location, along with a retinue of 3 other mercenaries.
Behind the Scenes
Shadow of Chernobyl 'bio' file
A short bio, that was omitted from final version of S.T.A.L.K.E.R.: Shadow of Chernobyl game describes him as follows: 
- S.T.A.L.K.E.R.: Shadow of Chernobyl, v1.004; stable_bio_name.xml