The lawyers calculate the compensation for your family that are left behind on how much you had to suffer before the impact and death.
I'm wondering where you got this information. Under the law of wrongful death, this really shouldn't be considered. Wrongful death is not a common law tort in the United States. Most states have statutes defining wrongful death and how it can be compensated. In general, wrongful death is designed to compensate family members, not the deceased. It is supposed to account for lost wages, loss of companionship, etc. Under these standards, it shouldn't matter how a person dies or whether he suffered.
Of course, with a creative plaintiffs' bar like we have in the US, I'm sure lawyers can often pull at juries' heartstrings and get more cash for their clients (and themselves, of course) by calling attention to the suffering. Gotta love the civil justice system in the good ol' USA.
"Lose" is not spelled with two o's!!!!