wrongfully terminated

My fiance was recently terminated. It was following a theft that he was found not to be responsible for. The theft was involving him and three other individuals. All four were sent home pending an investigation and contacted at later times for questioning. He was told they liked one of the other individualsfor the theft the following monday and was told to report to work in uniform on that day at his scheduled time where he was terminated. He specificly asked if he was being blamed for the theft and they said no.
The G.M. has had complaints filed against him on numerous occassions for race discrimination by several african americans. Since these complaints were made he refuses to repremand anyone that is african american or not caucasion. It just so happens that the other three individuals involved in the incident were african american and my fiance is not. He has had a clean employee file with this company. As a matter of fact, few months ago when they were doing layoffs the G.M. tried to layoff my fiance, being that he was one week shy of meeting his ninety-day probationary period, and his chief engineer fought to keep him. The chief engineer was able to work with the head of banquet department to switch him over to banquets schedule until business picked up and move him back. The chief engineer valued him so much as a worker and thought he was irreplaceable.
When the incident involving the theft occured the chief engineer was on vacation, hunting in the mountains, and was unable to be reached by phone. There are quite a few people still employed with the company willing to confirm theG.M.'s motives and prejudice ways.
Is there any chance in a valid and strong lawsuit and should we persue it any further????