Weight lifting to mma?

i used to be crazy about weight lifting but i was young wen i was doing weight training :P but b4 weight training i used to do mma.... but i do mma now lol. but b4 i started i been looking up about mma, they do weight lifting yh and im just wondering.... do i hav to do weight training in mma.... is there eny perfesional fighters who dont do weights :S just techniqe training, cardio.... cause i did alot of weight lifting :P had to stop cause my muscles were going bad, so in conclusion, do u hav to do weight training, plyometrics ect.... to be a good fighter... or is it just about skill