These two books sound crazy similar... I have read Kiss Me Kill Me. When I saw the description of Who I Kissed on NetGalley, I immediately thought of Lauren Henderson's book. If you look on Goodreads, (click on the picture to go there) I'm not the only one who thought so. Other comments say the same thing.
Kiss Me Kill Me
By Lauren Henderson
Delacorte Books for Young Readers, 2008
When 16-year-old Scarlett Wakefield transfers from St. Tabby’s to Wakefield Hall Collegiate, she is relieved that no one knows her dark, haunting secret. A few months ago, Scarlett was invited to an elite party with a guest list full of the hottest names in British society, including Dan McAndrew. Before the party, Scarlett had only imagined what it would be like to have her first kiss with Dan, but on the penthouse terrace, Dan leaned in close and she no longer had to wonder. Their kiss was beautiful and perfect and magical, and then . . . Dan McAndrew took his last breath as she held him in her arms. No one knows how or why Dan died, and everyone at St. Tabby’s believes Scarlett had something to do with it. But now that she’s safely hidden away at Wakefield Hall, Scarlett would rather forget that it ever happened. Only she can’t. Especially when she receives an anonymous note that will set her on the path to clearing her name and finding out what really happened to the first and last boy she kissed.
Who I Kissed
By Janet Gurtler
Sourcebooks Fire, Oct 1, 2012
She never thought a kiss could kill…
Samantha didn’t mean to hurt anyone. She was just trying to fit in… and she wanted to make Zee a little jealous after he completely ditched her for a prettier girl. So she kissed Alex. And then he died--right in her arms.
Sam is now the school pariah and a media sensation--how did she not know Alex had a peanut allergy? Consumed with guilt, she’ll have to find a strength that goes way deeper than pulling off a fastest time in the 200-meter butterfly. Because if she can’t figure out how to forgive herself, no one else will either.