Mark Nida, 63, of Pleasanton, who was driving the motorcycle, and 64-year-old Kathleen Seifert, who was his passenger, were taken to Eden Medical Center in Castro Valley to be treated for their injuries but Nida was pronounced dead a short time later and Seifert died later that night, Hahn said.
Peterson, 36, of Tracy, was arrested after the collision but she was released while officers from the CHP's Dublin area and Golden Gate offices completed an extensive investigation, according to Hahn.
The investigation was presented to the Alameda County District Attorney's Office on March 7 and prosecutors charged her with two counts of vehicular manslaughter while intoxicated, Hahn said.
Peterson turned herself in at the Santa Rita Jail in Dublin at 2:20 p.m. on March 20, according to Hahn.
Capt. Christopher Sherry, commander of the CHP's Dublin area office, said in a statement, "This collision was a preventable tragedy. Two innocent lives were lost because someone chose to drive under the influence of alcohol."
Sherry said, "I am pleased that the suspect in this crime has been arrested. Nothing can bring back the lost lives, but I hope this arrest brings some comfort to the victim's family and friends."
He said, "More than one-third of all traffic-related deaths in California involve alcohol. As a community, we will not tolerate it."
In other news
* A federal appeals court Monday upheld the dismissal of a negligence claim against the city of San Francisco and former Sheriff Ross Mirkarimi by the parents of Kate Steinle, the Pleasanton native killed by a bullet from a gun held by an undocumented immigrant in a case that captured national attention.
A panel of the 9th U.S. Circuit Court of Appeals said Mirkarimi was acting within his discretion when he issued a 2015 memo limiting the amount of information jail staff could give federal authorities about the release of inmates who were undocumented immigrants.
The court said that while federal laws require sharing of some information with U.S. Immigration and Customs Enforcement, the laws "plainly and unambiguously" do not require notification of jail release dates.
Steinle, 32, who grew up in Pleasanton and graduated from Amador Valley High School, was killed while walking on Pier 14 in San Francisco on July 1, 2015, by a ricocheting bullet from a gun held by Jose Ines Garcia Zarate.
Garcia Zarate, a Mexican citizen with a history of drug convictions and deportations, was released from San Francisco county jail two and a half months earlier. The jail staff did not inform ICE about the release.
Garcia Zarate was acquitted in a San Francisco Superior Court trial of Steinle's murder, but was convicted of being an ex-felon in possession of a gun. He is appealing that conviction.
The lawsuit by parents Jim Steinle and Elizabeth Sullivan still contains an additional claim against the U.S. Bureau of Land Management. The gun held by Garcia Zarate was stolen four days earlier from a bureau ranger's car, and the parents claim the ranger violated a duty to secure the loaded handgun properly.
* Two guards at the Santa Rita Jail in Dublin were taken to a hospital Sunday after possible exposure to fentanyl, according to the Alameda County Sheriff's Office.
Around 11:45 a.m. Sunday, staff in the jail's booking center searched a woman who'd been arrested in Oakland and a female deputy allegedly found a dark substance, rolled into a piece of tissue, that did not appear to be consistent with commonly seen narcotics.
That deputy contacted a sergeant, and both staff members examined the substance while wearing gloves and taking other precautions, according to the sheriff's office.
A little later, the sergeant got sick and became incoherent. The deputy also started to complain of similar symptoms, and jail staff determined that they were consistent with exposure to an opioid.
They administered a dose of Narcan, also known as naloxone, to both the sergeant and the deputy and transported them to a hospital. They have since been released.
Jail staff are sending the narcotics in question to a crime laboratory for identification and analysis.
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