Andrew Thomas Gallo ran a red light in his minivan early Thursday and broadsided a car carrying Adenhart and three friends, police said.
"At the time of the crash, Mr. Gallo's blood-alcohol content is estimated to be almost three times the legal limit," Orange County District Attorney Tony Rackauckas said.
Gallo could receive almost 55 years to life in prison if convicted of all charges, Rackauckas said.
Adenhart died at a hospital, hours after pitching six scoreless innings in his season debut against Oakland. He was remembered before the start of Friday night's Angels game against the Boston Red Sox.
"This Angel and his two friends were too young to be sent to heaven but the defendant selfishly and recklessly [got] behind the wheel after getting drunk. They didn't have a choice. Bad decision, blink of an eye, five lives ended, including the defendant's life is wrecked," Rackauckas said at a news conference.
Gallo will likely be assigned a public defender at his first court appearance, scheduled for Monday. He is being held on $1 million bail.
Gallo also was charged with driving under the influence causing injury, and driving with a blood-alcohol level over .08 percent causing injury, with a sentencing enhancement that he personally inflicted great bodily injury.
In addition, he was charged with fleeing the scene of a traffic accident causing death or injury.
Fullerton police Lt. Kevin Hamilton said homicide detectives interviewed Gallo for nearly four hours Thursday. "There was a lot to talk about," Hamilton said, without disclosing details.
Police initially said Gallo lived in Riverside, based on the
address listed on his driver's license. Gallo, however, gave police
an address in San Gabriel when he was booked and officers were
investigating that location Friday.
After Wednesday night's game at Angel Stadium in Anaheim, Adenhart went out with his friends. They were driving through neighboring Fullerton when their car was hit at an intersection.
Henry Pearson, 25, of Manhattan Beach, and the driver, 20-year-old Courtney Stewart of Diamond Bar,
were pronounced dead at the scene.
Another passenger, 24-year-old Jon Wilhite of Manhattan Beach,
was taken off the critical list Saturday morning and upgraded to serious condition. Spokesman John Murray at the University of California, Irvine
Medical Center said Wilhite remained in intensive care.
"His vital signs were stable. Yesterday and Thursday they were unstable," Murray said Saturday after speaking to Wilhite's attending physician.
Wilhite's uncle said in a statement the family's thoughts were with the families of Adenhart and the other two people killed.
"We are also overwhelmed by the outpouring of love and support we have received since this senseless act of violence and ask for your continued prayers for Jon's recovery," Charles Wilhite wrote.
According to court records reviewed by The Associated Press,
Gallo pleaded guilty to drunken driving in 2006 in San Bernardino.
He was sentenced to two days in jail, three years of probation, a
$1,374 fine and a four-month alcohol treatment program, court
records show. He didn't serve any jail time, however, because he
received credit for time served.
A judge also restricted his driving privileges for three months,
allowing him to commute only to and from work and his treatment
The district attorney, however, said Gallo's license had been
suspended since 2006. Assistant District Attorney David Linden
Brent said it was not unusual for the California Department of
Motor Vehicles to issue a stricter suspension after an
Court records show Gallo violated some terms of his probation,
causing it to be extended by a year, to 2010.
San Bernardino County Deputy Public Defender Maria LaCorte, who
represented Gallo in the 2006 drunken driving case, did not
immediately return a call for comment Friday.
Hamilton said Gallo was arrested for public intoxication in
March 2007 and convicted of disturbing the peace in January.
Court records show Gallo pleaded guilty to possession of less
than one ounce of marijuana in April 2007, and was convicted of
failure to wear a seat belt in 2006. He also had a minor driving
infraction several years ago, court records show.