Joe Driscoll is a character from DEXTER. Joe was a former U.S. Army Veteran who served in the Vietnam War but following his time in service he became addicted to drugs and even became a criminal. He was the biological father of Dexter Morgan. His exact relationship with Laura Moser is not made clear, nor it is specified whether he was Brian Moser's father as well.
Joe was in the U.S. Army and served in the Vietnam War, and later became a drug-addicted criminal, at some point being imprisoned. When Laura was exposed and murdered for being involved with the police in their attempts to bring their gang to justice, Joe went underground, abandoning his sons to the justice system, and settled in Dade City, Florida. This was the reason Joe adopted the name "Joseph Driscoll"; his real name remains unknown. Dexter does not know or remember anything about Joe, except for the spider-web tattoo on his right elbow, and finds out he is an expert bowler and recovered from his drug abuse.
Harry Morgan, Dexter's adopted father, was able to track Joe down, and convinced him to give a transfusion of his rare blood when Dexter was injured in an accident and needed surgery. Joe then received a handmade thank-you-card, which he apparently treasured, and, in the event of his death, named Dexter his son, next-of-kin and executor-of-his-will, leaving him his house and all his possessions.
Joe met his death at the age of 60, when Brian (now the Ice Truck Killer and going under the alias of "Rudy Cooper"), who knew it was the best way to reconnect with his long-lost brother, tracked Joe down and got access to his house while disguised as a cable repairman. Brian was able to slip Joe a sedative, and then injected him with diabetic insulin, causing Joe to have a seizure and die of cardiac arrest.
When Dexter, Rita, Debra (Dexter's adopted sister) and "Rudy" came to sort out Joe's house, Dexter took blood samples of himself and Joe and sent them to Vince Masuka to perform a DNA test, which came back as a match. Dexter suspected that Joe's apparent heart attack was actually murder. However, the body was cremated before Dexter could obtain proof, and as such, he never found out what "Rudy" had done. After Rudy and Dexter stole the ashes, Joe was laid to rest by his sons when they scattered Joe's ashes at the entrance of Joe's favorite bowling alley.
- Joe and Dexter, when compared, are shown to have great physical resemblance, and Dexter also inherited his father's bowling skill.