Any ideas on what Jenner whispered to Rick from Season 1?
My thoughts - SPOILERS
In the comics, it is established that if you die, you come back as a zombie. It doesn't matter how you die. As long as your brain is intact when you die, you turn. Basically - everyone's infected.
Therefore, its possible thats what Jenner whispered to Rick in Season 1. During the bar shootout at the end of Episode 8, Season 2, Rick kills both Dave and Tony. He got one shot off Dave, which was a headshot, but it was how he killed Tony. After killing Dave, Rick spun around and shot Tony once in the upper body, close to his arm. Shot him again in the stomach area. By this time, Tony was already falling. Rick takes a few steps toward Tony and then comes the headshot. Some say it was to make sure he was dead, I think it was to prevent him from turning.
The bar scene was well done though.