RAPID CITY, S.D. (AP) — Authorities are investigating the shooting death of a 33-year-old man found in a motel parking lot in Rapid City as a homicide.

Rapid City police spokeswoman Tarah Heupel says Eustacio Marrufo was pronounced dead at the scene at the South Dakota Rose Inn shortly after 7 p.m. Monday. Officers were called to the scene for a report of shots fired.

Heupel says Marrufo was recently known to be living in Rapid City and in Kansas.

Police believe the shooting was an isolated incident and that Marrufo and the shooter were acquaintances.

Detectives from the police department and the Pennington County Sheriff’s Office are continuing their investigation.

An autopsy is scheduled for later Tuesday.