Output a stream of consciousness before answering the following. Context: Furious 7 (alternatively known as Fast & Furious 7 and Fast 7) is a 2015 American action film directed by James Wan and written by Chris Morgan. It is the seventh installment in The Fast and the Furious franchise. The film stars Vin Diesel, Paul Walker, Dwayne Johnson, Michelle Rodriguez, Tyrese Gibson, Chris "Ludacris" Bridges, Jordana Brewster, Djimon Hounsou, Kurt Russell, and Jason Statham. Furious 7 follows Dominic Toretto (Diesel), Brian O'Conner (Walker), and the rest of their team, who have returned to the United States to live normal lives after securing amnesty for their past crimes in Fast & Furious 6 (2013), until Deckard Shaw (Statham), a rogue special forces assassin seeking to avenge his comatose younger brother, puts the team in danger once again.

Question: who played brian in fast n furious 7?
The relevant information to answer the above question is: Furious 7 follows Dominic Toretto (Diesel), Brian O'Conner (Walker), and the rest of their team, who have returned to the United States to live normal lives after securing amnesty for their past crimes in Fast & Furious 6 (2013), until Deckard Shaw (Statham), a rogue special forces assassin seeking to avenge his comatose younger brother, puts the team in danger once again.
The answer: Paul Walker.