Daniel O'Reilly rode his bicycle to work at least once a week.
For nearly a dozen years, he was in the saddle by 6 a.m., pedaling from his Sonoma home to an office at Kendall-Jackson Wine Estates in Santa Rosa, where he was a marketing analyst.
The ballet dancer-turned-environmentalist was as serious about fitness as he was about keeping the air clear of car emissions, family members said.
O'Reilly's routine ended tragically Monday night on his way home from work when he was struck and killed by a suspected drunken driver on Mark West Springs Road north of Santa Rosa, authorities said.
He was the second bicyclist killed in Sonoma County by a driver believed to be intoxicated in little more than a week.
"I just don't understand how someone could get behind the wheel of a car when they're impaired in any way," said O'Reilly's wife of 12 years, Patricia. "How could they get behind the wheel?"
The driver, William Michael Albertson, 46, of Cobb, was in the Sonoma County Jail on Tuesday. He was booked on suspicion of drunken driving and vehicular manslaughter.
Chief Deputy District Attorney Larry Scoufos said prosecutors had not received a report from investigators, which might delay an arraignment set for today.
Albertson was held without bail because his arrest violated terms of his parole for a Lake County battery conviction.
O'Reilly's death followed by eight days that of triathlete Alan Liu, 31, of Mountain View, who was struck and killed Easter Sunday on Highway 12 near Oakmont. His riding companion, Jill Mason of Cupertino, remains at Santa Rosa Memorial Hospital, recovering from critical injuries.