It depends on whether your talkin bout the US F-4 or the F-4's that other countries use that we gave them. It was retired in 1995 by the states but is still in use in countries such as Turkey I believe. As for its last kill I dont know. I'm still looking.
C/CPO
By the way I did my Naval Vessel report on the F-4 Phantom. It's an awesome aircraft. Not as good as our new stuff but even still it was ahead of its time and the building block for our latest jets.