If you haven't yet read the Wells Report, which is the result of the DeflateGate investigation, you can do so right here. The basic summary of the investigation can be laid out on page two:
In particular, we have concluded that it is more probable than not that Jim McNally (the Officials Locker Room attendant for the Patriots) and John Jastremski (an equipment assistant for the Patriots) participated in a deliberate effort to release air from Patriots game balls after the balls were examined by the referee. Based on the evidence, it also is our view that it is more probable than not that Tom Brady (the quarterback for the Patriots) was at least generally aware of the inappropriate activities of McNally and Jastremski involving the release of air from Patriots game balls.