Wenzel said Fuchs' mother reported hearing an altercation of some sort outside the home prior to the single gunshot. He did not say how many people were on the porch at the time or whether she knew who the people involved were.
Police have ruled out random violence as a cause for the shooting and are focusing on other students who were known to associate with Fuchs.
"We've talked to friends, family and neighbors. It's based on the information we've collected at this point," Wenzel explained.
No motive has been given for the shooting.
Fuchs was a senior at San Ramon Valley High School, set to graduate in June. School District spokesman Terry Koehne addressed reporters and offered the district's sympathy to Fuchs' family.
He said the students and faculty at SRVHS were shocked by the news.
"They're very emotional. They're trying to grapple with this." He added, "Rylan was a relatively quiet but well known kid on campus."
Counselors have been called in to the high school to handle the situation and to help the students and faculty work through the shock and grief. "We've mobilized our crisis team on campus," said Koehne. "They will be there for as long as they're needed."
An autopsy on Fuchs was held Wednesday afternoon in the Contra Costa County Coroner's office.
Chief Wenzel said incidents like this one are isolated in Danville and they are working around the clock to see it resolved.
"We've got 10 detectives working on this case," he said. Fuchs' death is the first homicide in Danville since January 2007
Wenzel asked that any person with additional information immediately contact Danville Police Lt. Mark Williams at 314-3701.
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