<P> Production commenced in Newnan, Georgia at Newnan High School in early July 2011, after attaining approval from the city council and the Coweta County School System . The episode featured guest appearances from Scott Wilson, Lauren Cohan, Emily Kinney and Pruitt Taylor Vince, amongst several other recurring actors and actresses for the series . "Bloodletting" was well received by television critics, who praised the character development in the episode . Upon airing, it gained 6.70 million viewers and garnered a 3.6 rating in the 18 - 49 demographic, according to Nielsen ratings . </P> <P> In a flashback, Lori Grimes (Sarah Wayne Callies) is talking with other mothers about a fight she had with her husband, Rick (Andrew Lincoln). Rick's partner, Shane Walsh (Jon Bernthal), pulls up in a police cruiser and tells Lori that Rick has been severely wounded in a highway shootout . Lori then tells her and Rick's son, Carl (Chandler Riggs) the news, causing him to break down in tears . </P> <P> In the present, Carl has been accidentally shot by a man named Otis (Pruitt Taylor Vince), who was hunting for deer . Otis brings Rick, Carl and Shane to a veterinarian named Hershel Greene (Scott Wilson), for whom Otis works as a farm hand . Hershel lives with his daughters Maggie (Lauren Cohan) and Beth (Emily Kinney), Beth's boyfriend Jimmy (James Allen McCune), and Otis' wife Patricia (Jane McNeill). He treats Carl, but he reveals that the bullet was broken into six fragments . Rick must donate blood to Carl in order to keep him alive . </P> <P> Lori, Glenn (Steven Yeun), Carol (Melissa McBride), Daryl (Norman Reedus), and Andrea (Laurie Holden) are still searching for Carol's daughter, Sophia (Madison Lintz), when they overhear a gunshot . Meanwhile, on the highway, Dale (Jeffrey DeMunn) believes that T - Dog (IronE Singleton) has contracted a blood infection from the wound he received in the previous episode, and both search for antibiotics, but they fail to find any . </P>

Who shot rick's son in the walking dead