Terry McCreight is the Chief Investigator of the Criminal Investigation Division.

This division is responsible for all felony crimes. These Investigators all have specialized training so that they can assist the members of the community when a crime has occurred. The division is comprised of investigators who work all the felony cases such as homicides, home invasions, kidnapping, grand larceny, bomb threats, felony child abuse, rapes/sexual assaults, fires, cyber crimes and any others that come in to their office.

Additionally, the Sheriff's Investigative Division has several investigators that have specialized training in, arson investigation, firearms training, dive & rescue, sheriff's boat patrol, child sexual abuse, man tracking, cellular telephone and computer analysis.

Dyer County Sheriff's Office and the Dyer County Fire Department have partnered together in a fulltime County Arson Investigator.

Dyer County Sheriff's Office has a fulltime Investigator assigned along with a Dyersburg Police Department Investigator in a partnership with the Federal Bureau of Investigation in a Federal Violent Crime and Drug Task Force targeting Violent Crimes, Drug and Gang activity resulting in numerous Federal Prosecutions of Criminals.

Investigators are also on call to assist with high risk arrests/warrant service, other manpower intensive investigations and suppression of criminal activities targeted by the sheriff.