The deaths of seven people in the past six months in the Petaluma River and along the city's byways are disturbing but not a sign of increasing violence or criminal activity, police and homeless advocates say.
All the bodies have been found outdoors. One was the skeletal remains of a woman on the McNear Peninsula. Two others were suicides. Four had been homeless or were homeless at the time of their deaths.
Foul play isn't suspected in any of the cases, police said.
If anything, a theme may be hopelessness, said Mike Johnson, the head of Petaluma's Committee on the Shelterless.
"It continues to raise a flag," he said. "They were all extremely vulnerable individuals."
That vulnerability has many causes.
"The kinds of things that make people vulnerable are the kinds of things that are killing these folks: a history of drug use, alcohol use, what kind of condition their bodies are in ... co-occurring health problems — diabetes on top of liver disease on top of heart disease. They all stack up."
The suicides also are a form of vulnerability, he said: "They've got some serious, maybe untreated, mental health issues they're struggling with."
Police say the frequency of the deaths is unusual.
"I don't think we've had this many found outside in the elements before," Lt. Tim Lyons said. "It's different than in the past, when we've had one or two a year."