Is it ok to cry ?

My husband just commit suicide this morning after 5 years of marriage I don't know why he do this. He was the guitar player for my band I'm the lead singer. We're gonna go to see our family this summer I don't know when yet have a small family reunion for him we're not just a band were family who care about each other. Our drummer died 2 years his son plays drums now he's my god son I'm also like an uncle to him since I grew up with his dad. I've lost two bandmates in 2 years. I wished I known I would have tried harder to comfort him or to get him help. We may do a memorial concert for him like we did for our drummer over the weekend. One song we have on our set list is I'm Already There I can't stand to listen to it but it was one of his favorites it'll hurt me even more now that we have kids of our own we adopted my daughter is going through a rough time accepting her dad is gone. I noticed he wasn't in bed this morning I found a suicide note from him then I found him out in the yard he had a razor he cutted himself to death he was laying by the pool our daughter is only 4. Is it ok to cry ? How can I explain it to her ?