The death of a man found face down in a west Petaluma drainage ditch remained under investigation Friday as suspicious, but police officials were releasing no details.
The Sonoma County Coroner's Office declined to give his name, as efforts still were underway to notify family.
He was found Thursday morning in standing water near the Town and Country Shopping Center at Petaluma Boulevard North and Payran Street, just blocks from the police department.
Petaluma Sgt. Ken Savano Friday detectives were awaiting an autopsy and further investigation in an attempt to determine what happened to the man and when he died.
It is standard procedure for police to treat deaths as suspicious when the cause remains undetermined.
Savano declined to say whether the man was believed to be a transient.
There have been a string of deaths of Petaluma area homeless people since August.
If this man was a transient, he would be the fourth.