Wether I know this person or not upon hearing about their depression and if I’m presented with the opportunity to approach them I would set aside time with them as often as I’m able and support them by remaining silent, (refrain from making suggestions or giving advice), and just listen. I’ve experienced the dark days of depression and I know this one; the people who listened the most by just sitting with me and saying very little were the ones who helped me the most.
If you know someone who is affected by depression, spend a little more time than you usually would and just listen to them and don’t speak unless you have to. Chances are they’ll figure out something they already know that they must do to beat it…. I know, I was that guy once