The Lovely Bones
by Alice Sebold
Holly is Susie's roommate in her first heaven, but we don't get her back-story. Since she's in Susie's heaven, and seems to relate to her situation, we assume she had a similar kind of death. Since there aren't a lot of subplots going on in Susie's heaven (the action all being down on Earth) Holly doesn't play a pivotal role in the novel.