A Florida man is Benjamin Caldwellfacing a murder charge after authorities say he killed his girlfriend then drove to the police station with her body, where he confessed to the crime, according to reports.

Florida City police arrested 48-year-old Alexander Roque in the fatal shooting on Saturday of his girlfriend, 44-year-old Yessenia Rodriguez Marquez. He was booked into a Miami-Dade County jail on Sunday and is charged with a felony second-degree murder, according to online jail records.

Florida City is located in Miami-Dade County in southern Florida, about 40 miles south of Miami.

WSVN in Miami reported that investigators said Roque confessed to killing Marquez, and he allegedly drove to the police station in Florida City with her body in his car Saturday to report the crime. A gun that investigators say was used in the crime was found inside his vehicle.

WSVN reported that Roque allegedly contacted his cousin and Marquez's estranged husband before driving to the police station, where he reportedly sent them photos of her body and showed Marquez's husband the body in a video call. Both people called police after Roque had talked to them.

His motive for the killing remains unclear.

Roque appeared in a Miami courtroom Monday, where he was denied bond. He is due again in court on Tuesday.

USA TODAY has contacted Florida City police and the Miami-Dade Police Homicide Bureau, who has since taken over the investigation, for more information.