Grave Sight by Charlaine Harris

Harper Connley was struck by lightening at 15.  It left her with a spiderweb of red on her leg, a weak left leg, and the ability to find dead bodies and know what they died of. 
With an ability like that you have to make the most of it and she does, along with her brother, who acts as her manager.  They travel the country getting paid to find out what happened to cause the end of life.
When called to find a body in Arkansas things get a bit complicated.  She becomes involved in the town much more deeply than she ever wanted to participate to put it mildly.
If you are a Harris fan you could see Harper living in Midnight, Texas or being friends with Aurora Teagarden solving cold case files.  Very enjoyable read.