Although Mary technically died in the season four finale "Mr. Yin Presents. . .," the character has come back numerous times, in both flashbacks and hallucinations. In Psych 2, Mary is a hallucination shared by both Shawn and Gus after they take some laced ice chips. However, he appears in the form of a baby, thanks to Shawn thinking that Juliet is pregnant. This leads to a rather awkward exchange resulting in Mary saying, "I'm a baby, Shawn. It's glorious, I just finished teething. Have you ever been swaddled? It's like a joyful mummification." Much like in Psych the Musical, there's a poignant (albeit odd) song moment between the group.