ATLAS, Pa. — Authorities have said in a court document that investigators believe a man found slain on a Pennsylvania walking trail was killed in a botched robbery.

The body of 33-year-old Sean Maschal was found Wednesday on a trail through wooded former coal lands near Locust Gap in Mount Carmel Township. The Northumberland County said he had been shot in the head.

The (Sunbury) Daily Item ( ) reports that township police chief Brian Hollenbush confirmed a document sent to the paper as a legitimate affidavit of probable cause included in a search warrant and containing a theory that Maschal was set up for a robbery that ended in his death.

Officials said three men named in the warrant are in custody; a woman is being sought. No charges have been filed.

Information from: The Daily Item,