I suspect that Bret  Partridge is not dead, and even may be Red John or an associate.  Just because he was covered with blood and collapsed in front of Lisbon, doesn't necessarily mean that he is dead.  I'm waiting to see next weeks episode to see if his body is found.  The voice that spoke on Teresa's phone sounded exactly like Partridge.  He was the most popular suspect before Episode 6.1, and it would be good writing to have him supposedly killed off, while hiding in reality.  He also knew the phrase 'Tyger Tyger' which is Red John's favorite.