How Do I Tell My Boyfriend He Stinks?

I really need to be gentle with this. My boyfriends brother just died from suicide. The last time they talked he was supposed go over to his brothers house to hang out, but he ended up getting really busy. He said he would come in the morning. His brother took his life that day and when my boyfriend went to see him in the morning, he left the door unlocked and he saw his brother hung himself in his room. Its been 12 days since he died. My boyfriend has been super depressed and just laying in bed all day. He hasn't showered and he stinks really bad. How can I be gentle and tell him he smells bad and that he should shower. I know this can't be healthy.