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Deputy Sheriff Dwight "Dewey" Riley is a fictional character from the horror franchise Scream created by Kevin Williamson and portrayed by David Arquette.

Dewey is presented as the Deputy Sheriff of the local police department in the fictitious town of Woodsboro, California. He assists his sister Tatum's friend, Sidney Prescott after she is stalked and attacked by a masked killer. During the case he meets tabloid reporter Gale Weathers and the two begin a romantic relationship.

Arquette, along with Neve Campbell (Sidney Prescott), Courtney Cox (Gale Weathers) and Roger L. Jackson (Ghostface) are the only actors to appear in every installment of the Scream franchise, with all four set to reprise their roles in the upcoming fifth film set to release in 2022.

Scream
Dewey Riley was born in 1970 in Woodsboro, California and is the older brother of Tatum Riley, the best friend to Sidney Prescott. Eventually Dewey became the Deputy Sheriff of Woodsboro serving under Sheriff Burke. After the murder of Sidney and Tatum's classmates Casey Becker and Steve Orth, Dewey tries to be protective of his sister and Sidney, but comes off as slightly overbearing and timid. During the investigation, Dewey meets reporter Gale Weathers, and the two begin to develop feelings for each other. After dropping Sidney and Tatum off at a party hosted by Stu Macher, Dewey meets up with Gale and enter the party. It is revealed that Gale only entered the party to place a camera by the television to keep a watch out in case the masked killer makes an appearance. The two leave the party and go on a stroll nearby. During their stroll, Tatum is murdered by Ghostface with a garage door. While Dewey and Gale are walking they fall down a hill and find the car of Neil Prescott, Sidney's father and the believed suspect of the killings. Gale and Dewey return to the house where Dewey is stabbed in the back, narrowly surviving. The killers are revealed to be Stu Macher and Billy Loomis and both are killed by Sidney and Gale. Dewey is carted off in an ambulance as one of the only four survivors, along with Sidney, Gale and Sidney's friend Randy Meeks.

Production
Dewey was initially planned to die at the end of the first film, but director Wes Craven was fond of the character and filmed a shot where Dewey was carried off in an ambulance in case audiences liked the character. Fans reacted strongly to Dewey and the character returned for the sequels. Actor David Arquette revealed later that he turned down the role of Billy Loomis and chose to play Dewey instead. Dewey is parodied in the Scary Movie franchise with the character of "Doofy Gilmore" played by Dave Sheridan. In these films, Doofy is revealed as the killer in the finale.

In Scream 2, Dewey's appearances are accompanied by excerpts from Hans Zimmer's score for the 1996 action film Broken Arrow. Composer Marco Beltrami later explained that the Zimmer score was initially used as a placeholder for Beltrami's incomplete score during a test screening. Audiences reacted positively to the sting and influenced the producers to keep it in the film.