<human>: Can you condense the text into three sentences or less?

My (F 23) now ex-stepbrother (M 21) has always been a member of my family, no questions asked. His mom had another son with her first husband, making him my stepbrother's older half brother. Sorry, I know it's confusing. 

The older brother was just killed in a car accident yesterday and I don't know what to do. I'm across the country working for a couple more months so I'm trying to do everything I can but I'm limited in my options. My heart aches for him. Our parents are no longer together so we have no blood or marital connection, but that doesn't stop him from being my family. He was very close to his brother but I barely knew him. 

People who have experienced this kind of thing, what really helped? What was unhelpful? I know I can't fix it but he's the kind of guy who is extremely self contained and I don't want him to feel alone or like he needs to move past this or anything. I feel helpless.
<bot>: Stepbrother's brother died and I desperately want to be as supportive and helpful as I can be but I'm at a loss.