Mare of Easttown: Checking in With the Most Popular Theories About Who Killed Erin

Kenny's cousins John and Billy seem to be supportive and empathizing with Kenny when they first heard about Erin being gone. While on paper only Kenny owns a firearm, the glimpse of episode 5 shows that Billy may have one as well. Is it the one that was used to fire on Erin? We'll finally know more about that in the upcoming episode.