Emergency crews arrived at the scene and attempted life-saving efforts, however, the rider was pronounced dead at the scene.
Officials from the Central Marin Police Authority said Treasure Anderson, 12, was found safe Sunday night in San Anselmo.
A look at a few of this week's police, fire and courtroom incidents around San Anselmo and Fairfax and across the North Bay.
Residents are asked to be alert for suspicious people or vehicles near mailboxes, following an increase in mail thefts in San Rafael.
BREAKING: The 12-year-old was reported missing by her grandmother when she did not return from school Monday, police said.
BREAKING: Both incidents were Wednesday night on Sir Francis Drake Boulevard in San Anselmo, authorities said.
Central Marin police join an effort combatting the county's No. 1 cause of accidental death.
One of trio convicted, a woman from San Rafael, will be eligible for a youthful offender parole hearing after serving 25 years. (BREAKING)
Two of the four suspects were just 14 years old, according to authorities.
"We have a duty to protect Californians visiting our parks and beaches to protect public health and our environment."
The sheriff's office says they arranged a "meeting" with a person who stole the bike and had posted it for sale online.
The Central Marin Police Authority, which covers Corte Madera, Larkspur and San Anselmo, has seen a rise in thefts from vehicles this year.
Avoid becoming a victim to telephone and email scams this tax season by following these simple tips.
There's been a spike in the number of reported car break-ins and burglaries in recent weeks in and around San Anselmo.
The Central Marin Police Authority serves Corte Madera, Larkspur, San Anselmo and portions of Greenbrae.
Police said Fionn O'Lochlainn, 46, of Penryn, allegedly assaulted his girlfriend in Tigard, Oregon, forcibly took their daughter and fled.
BREAKING: Residents may see or smell smoke in the North Bay on Friday. Firefighters are working on a controlled burn near Big Rock.
Marin County Fire and Ross Valley Fire Department firefighters saved two grandparents and their two grandchildren.
BREAKING: "Flood waters are fast moving and very dangerous," police said.
BREAKING: A downed tree fell on a Fairfax home Tuesday trapping a family inside. No injuries were reported.
BREAKING: Residents may see or smell smoke in the North Bay during the day Thursday.
Thomas Pope Sr. and Gardner Pope “both verbally obstructed and delayed officers from executing the arrest warrant,” officials said.
Avoid Christmas tree and other holiday-related fires with these simple tips from Mill Valley Fire Department.
The Special Needs Registry is a voluntary program that aims to assist officers with responding to local residents with special needs.
An earlier gas line break on Calumet Avenue in San Anselmo caused traffic delays.
The Central Marin Police Authority is inviting area residents out to an informal gathering in which you can meet the officers who serve you.
The apartment fire was quickly handled by the tenant.