Newport Beach City Attorney Aaron Harp said all of their reports are confidential.
In an email Thursday, Harp wrote that one of the city's attorneys directed officials to create the reports so they were protected under the attorney-client privilege. They also pertain to pending litigation, according to the city's official response letter.
Harp said he is not aware, however, of any pending claims or lawsuits filed against the city that are related to the motorist's death.
Miller's family is devastated, and has decided to wait on any legal action, according to Miller's longtime boyfriend, George Osorio.
Osorio, who lives in Tustin, said he received a card expressing condolences from the mayor, but otherwise has heard nothing from city officials. He thought that officials' actions since the tragedy, including removing about 100 trees on the same stretch of Irvine Avenue, points to the city's culpability.
"I'm very concerned that they're either hiding something, or further fueling that sense of guilt," he said.
Daily Pilot Editor John Canalis said the public deserves to know what happened.
"The tree that fell belonged to and was maintained by the taxpayers," he said, "and we believe they ought to have a look at the report. This document, in my view, belongs to the public."
Various theories attempting to explain why the 60-foot tree toppled over include it being affected by prior city roadwork or an earthquake the day before the incident.
mike.reicher@latimes.com
Twitter: @mreicher
