How do you help someone realize they are an alcoholic?

I work with a guy whose stories always involve alcohol and being drunk. Now I'm not substance abuse expert but having walked in those shoes I think that anyone who thinks so much about alcohol that it is a part of every story they tell is probably an alcoholic (based on the stories I have heard from him). He is sober by mandate right now- with the exception of any booze someone might smuggle him in a care package.
Do you approach people? In your early stages of recovery did anyone say anything to you that eventually inspired you to get sober? I work with this guy and will be working with him for the next year and I don't want to do anything to make the next year an uncomfortable experience. 

Has it been a year yet?

 It feels like I have been here F.O.R.E.V.E.R.! !!!! Ok… not forever- but July sure took a long time to get through.  I am trying to find some things that I can to help me keep moving forward emotionally and physically. I have been working out quite a bit and am getting in pretty good shape. I am also going to be sign up for my first ever 5k race in September. I have been reading the bible a lot along with some devotional passes to work on my mental health. But somehow, I don’t think I am doing as well as I could be. I have been suffering from a pretty significant bout of depression and feel like I am not performing as well as I should be at work, which is funny because they just took my teammate away because I was “holding it down on my own.” I guess they really mean it when they say “Army of one!” I guess once I get myself together mentally I will really blow them out of the water.  So, this is my dilemma- what the hell do I do with myself to get myself out of this emotional funk that I am in? I work 12 hours a day, 7 days a week. I go to the gym 6 days a week and have gained a lot of muscle and have lost 14 pounds so far (6 more to go to reach my goal!) I read at night before I go to bed- yet there is still this huge void in me right now. Sigh…