Need advice

Kelly • Married to my soulmate. Soon to be housewife. 6 animal babies. TTC #1 since July 2012...Hoping for a miracle soon!
This has nothing to do with ttc or anything. This might be kind of long, but I've known this kid for about 12 years. He's my brothers best friend. He is 17 years old and a father to a 6 month old. A few hours ago, he shot and killed himself. Back in 2012, April my husbands sister 27, overdosed & then in August my best friend (my sisters ex, brothers friend to) drowned in the susquhanna river at age 18. I'm wondering if anyone could give me some advice on how to talk my brother through this. My brother moved to NJ last week and just keeps saying if he was here he could have talked him out of it. I feel horrible that this ended the way it did.