On the tv show the walking dead, what happened to Shane
And I believe that the reason that Shane became a zombie after Rick stabbed him and killed him is because that knife was used to Stab a zombie before and it was infected .
In the show, Shane is killed by his High School best friend, Rick. This happens when he entices Rick out into a field to find an escaped Randall. However, Rick realizes his plan and stabs him to death. Shane later becomes zombified.
Shane died was infected zombie then Rick killed him but Shane was getting crazy