Authorities are investigating the death of a man near his home, where police say methamphetamine was being produced.

Patrick M. Pettit, 33, was found unconscious Monday morning near the intersection of South Seiberling Street and Englewood Avenue. He died later at Summa Akron City Hospital.

The cause and manner of death has not been established.

A spokesman with the Summit County Medical Examiner’s Office said an autopsy has been completed and authorities are awaiting toxicology tests. There were no outward signs of trauma on Pettit’s body.

Police investigating his death said they went to Pettit’s home on League Street and recovered “a full meth lab in the apartment.”

Officers arrested four people inside the apartment: Eugene D. McElwee, 48; Kurt D. Lansberry, 35; Stephanie M. Lansberry, 27; and Brian L. Wallace, 38. The four were charged with illegal manufacturing of methamphetamine, illegal assembly of chemicals, possession of methamphetamine and possession of drug paraphernalia.