ST. JOHNS COUNTY, Fla. -

Three people have been arrested in connection with the killing of a Jacksonville man found dead in the trunk of a car parked on a dirt road in Elkton in St. Johns County about two months ago.

Deputies arrested Harry Henderson, 31, Sharina Parker, 30, and Rodrick Williams, 16, all Jacksonville residents charged with the kidnapping and murder of 45-year-old James Brookins. Parker and Williams are charged with principal to murder and kidnapping.

Investigators said Brookins was beaten, bound with duct tape and shot. He was reported missing two days earlier by his mother and was last seen in Jacksonville.

Detectives said they identified and interviewed nearly 100 people over the course of the investigation and served a search warrant at a residence in the 2100 block of Caljone Road in Jacksonville where crime scene technicians located evidence that revealed the victim had been beaten by the suspects.

Detectives said they believe the motive appears to be retaliation in reference to an armed robbery that occurred during a drug transaction earlier that day in April in Jacksonville.

Individuals involved with the drug transaction believed that the victim was involved with the robbery, according to deputies, however, it was later learned that that was not true.

Detectives said they also obtained substantial evidence in the way of electronic communication that assisted in identifying the suspects.

Investigators said the U.S. Marshals Office was also instrumental in locating the three suspects and apprehending them on various charges not related to the killing.

Deputies said the investigation is continuing, and anyone with any additional information is asked to contact detectives with the St. Johns County Sheriff's Office at 904-824-8304.