He is one of a series of recurring background detectives in the Miami Metro Homicide Department. He first appeared in Season One and continued to appear in almost every episode of the eight seasons, along with partner adjacent, Detective Israel Yale. Another prominent background detective is Detective Hill.
Soderquist has gray hair and is highly visible in his signature "ice cream" colored polo shirts. Although most of the time he has a serious expression on his face, he occasionally is seen laughing with his co-workers.
He mostly acts in the background, following orders to investigate crime scenes and is around in times of emotional turmoil for the department, such as when Angel Batista was attacked by the Ice Truck Killer.
His first name is revealed on a nameplate only present after "Resistance Is Futile." Following the department's restructuring in Season Three, the nameplate is no longer there. Another oddity is that Soderquist is rarely seen sitting at this desk although at times it's used by Maria LaGuerta, Detective Hill, and Robert Ramos.
In "Easy as Pie," Dexter creates a list of who he is inviting to his wedding. He considers the detectives Soderquist and Robert Ramos, but Dexter doesn't remember the former's name. Once Angel Batista orders them both to keep surveillance on Anton Briggs, Dexter says the following, "THAT'S his name... Soderquist."
- The actor, Bruce Holman, also played a background Detective on the USA TV Series Monk. He can be seen briefly in the second episode of the fourth season behind Captain Leland Stottlemeyer before a scene transition.
- His name indicates Swedish ancestry, "Soderquist" is the Anglo-Saxon form of the Swedish "Söderquist" (roughly translating to "south twig")