According to TMZ..

Comedian Lavar Walker was approached after his comedy set by one of Mike Epps's people to meet Mike outside. Once outside the comedy club in Atlanta, Lavar was struck by Mike Epps and 2 other men. According to sources, Lavar had said a few jokes about Epps during his set and Mike was not too happy about it. 

I don't get it, Mike can dish jokes out at others but can't take the heat when it's thrown back at him??