Avary, 42, was charged with vehicular manslaughter and driving under the influence after Andreas Zini, a passenger in his car, died on Sunday.
At the time of the crash the 34-year-old was apparently visiting Avary and his wife, Gretchen, who was also was also seriously injured but is expected to survive.
Zini was cut from the vehicle by firefighters but died several hours later at Ventura County Medical Center.
An autopsy report issued on Monday determined that he died of "blunt force chest and abdominal injuries."
And now Avary has expressed his sympathy to Zini's relatives.
A statement from the writer says, "Roger wishes to publicly convey his heartfelt condolences to the family of the deceased. Words cannot express how sorry he is, and this tragic accident will always haunt him."
The writer, who has been freed on $50,000 bail, faces an arraignment hearing on Friday.
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