United States of Tara Season 3 Episode 10 (06/06/11)
Lionel is killed in a car accident this week, which really sends Marshall over the edge. Everyone gathers for a funeral, with Tara delaying her trip to the doctor in Boston to stick around for it.
But she transitions into Bryce as everyone leaves, destroying Marshall's room while they're gone. When the group returns, Bryce taunts everyone. He tells Charmaine and Neil that he stole Wheels and he talks trash about Lionel.
This is the final straw for Marshall. He tells his father he must leave and Max understands. Elsewhere, Kate chooses to really try a relationship with Evan.
To conclude the episode, Max asks Bryce when Tara is coming back. He replies that she's isn't - and proceeds to cut off his ponytail.