Jonathan William Scott Hofstedt (born October 23, 1969) is an American actor. Known professionally as Jon Huertas, he is best known for his role as witch hunter Brad Alcerro in Sabrina the Teenage Witch, Sergeant Antonio 'Poke' Espera in HBO's Generation Kill, Joe Negroni in the film Why Do Fools Fall in Love, homicide detective Javier Esposito in Castle and Miguel Rivas in This Is Us.