Anasa tristis
This doesn't appear to be an assassin bug: the body appears a bit too thick and the head isn't constricted between the eyes to make it look like it has a neck. However, it does appear to be in a related family: the leaf footed bugs, Coreidae. You were close, but not quite an assassin bug, sadly.
Lat: 40.48, Long: -86.88
Spotted on Sep 11, 2011
Submitted on Sep 23, 2011