Control Factor (2003)

Lance Bishop (Adam Baldwin) is an ordinary insurance executive whose life is turned upside down by a crazed gunman. Before the killer is shot dead himself, he issues a grim warning to Lance: "If only you knew what I knew." Haunted by nightmares, Lance begins hearing voices, which terrifyingly order him to murder his wife, Karen (Elizabeth Berkley). He realises he can trust no-one, particularly not the police agency investigating the killings and ulitmately, not even himself.