San Francisco police on Thursday made an arrest in connection with a homicide that occurred Wednesday near Union Square.

Christopher Hardee, 47, was arrested in Petaluma and booked into San Francisco jail Thursday evening on charges including murder, first degree robbery, first degree residential burglary and conspiracy to commit a crime. He is being held without bail.

Police said they found an unconscious man with serious injuries in the 500 block of Post Street near Mason Street shortly after 6:30 p.m. on Wednesday. Paramedics provided aid but the man, identified by the medical examiner’s office as 31-year-old Andrew Emmett, died at the scene.

The death was determined to be a homicide, but police have not released details on the nature of Emmett’s injuries or how they occurred.

Police have said they detained three people after executing a search warrant on Thursday in Petaluma.

The homicide marks the sixth reported in San Francisco so far this year.