Christov Mahonvic is a criminal in Liberty City who is wanted by the LCPD for grand theft auto. He can be killed by Niko Bellic, depending on the players choice. Mahonvic previously worked for both Vlad Glebov and Mikhail Faustin. During two missions Niko encounters him and it is possible to kill him, but somehow he survives and continues to live the criminal lifestyle up to the point where he is wanted by the L.C.P.D.
It is interesting to note that Mahonvic bears a striking resemblance to lovemeet user Mark Tenninch. Tenninch is most probably Mahonvic's secret identity, and that is his way of leading a double life.