Mark worries that his sleepwalking brother may be guilty of murder.

Steve investigates a murder in which the main suspect is the husband of Mark's old flame. Steve and Jesse date the same girl.

A devious home security programmer plots to murder the children of everyone involved in the accidental death of his son.

A body found on the beach turns out to be Jim, the hospital janitor, but when his twin brother Jeff shows up to identify the body, Mark and Steve become suspicious.

Steve nearly dies in a car accident and think a murder happens. No one believes him.

Mark goes after a man who killed a groom on his wedding day.

Dr. Mark Sloan, Lt. Steve Sloan and Dr. Amanda Bentley become involved when a priest is accused of murdering an old friend.

A young woman is assassinated while Dr. Mark Sloan is examining her, setting off an investigation that plunges Mark into dark memories of his own childhood.

Mark must find out why his dad left him as a child.

While deeply disturbed that his son, Lt. Steve Sloan, is falling in love with a woman who is a dead ringer for his murdered former girlfriend, Dr. Mark Sloan begins watching his neighbors through binoculars and becomes convinced that one of them is a murderer.