In Season 3, Episode 6 of Dead to Me ("We're Gonna Beat This Thing"), the crucial piece of evidence that resurfaces is a .
: This discovery is a breakthrough for Nick, as he correctly pieces together that these birds are connected to the investigation into Steve Wood's death and the hit-and-run.
: Nick brings this "Eureka discovery" to Detective Perez, who is visibly concerned and attempts to downplay its importance to protect Jen and Judy.