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ST. AUGUSTINE, Fla. -- The St. Johns County Sheriff's Office is conducting an investigation into an apparent double murder-suicide at a home in the Coronado neighborhood off of Wildwood Drive.

Among the dead are an elderly couple, Joyce E. Testa, 87, and Raymond Testa, 90, and their adult son and homeowner, Gregory Scott Testa, 51. All three died from apparent gunshot wounds, but the Sheriff's Office is not yet saying who fired the gun.

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Investigation into double murder-suicide underway in St. Johns

A Sheriff's Office mobile command center was on site and a search warrant was granted in order to enter the home at 452Gianna Way.

Police initially went tothe home around 12:25 p.m. after hearing from a concerned citizen.

Corporal Catherine Payne with SJSO said Gregory Testa'semployercalled becauseGregory Testahad not called or reported for workfor several days.

According to Dave Spring, a neighbor, the Testa family had been in the house for a few months. Spring said he walked by the home every day, but he never saw anyone there.

Investigators spoke with neighbors Tuesday. Crime scene technicians went in and out of the home. They also inspected thevehicles in the drive way.

According to a public records search, Gregory Testa previously lived in Marion, Ind., and he has two registered firearms.

The cause of the deaths are pending an autopsy, according to the St. Johns County Sheriff's Office.