What are people's best guesses as to what a defense would cost?
$100,000 for first degree murder, arrest through sentencing, not including expenses. The cost of private investigation is an expense, and would cost at least $100/hour. The cost of a forensic psychiatric examination + testimony of the psychiatrist can cost $50,00 and up (depends on whether it is a "high profile" forensic psychiatrist).
I have no clue what to estimate for an additional amount for defending a case in a death penalty state, or what premium to add for a famous or high profile attorney.
My best reasonable guess for all the costs of the defense is at least $250,000, ranging up to $400,000.
The smart criminal defense attorney charges a flat rate for legal fees + expenses, contracts for representation from arrest through sentencing,
and makes sure the defendant pays it all in advance, including a hefty retainer for expenses. Additional money must be paid for expert witnesses (psychiatrists) and for private investigators, unless those people make direct arrangements for their fees and expenses to be paid directly by the defendant.
There is a good reason for this, and that is that the defendant and his supporters won't have any incentive to pay their bills if the defendant is found guilty. They will be busily locating funds to pay for an appeal, unless they have an appointed lawyer. Plus, of course, the risk is high that any criminal defendant will not have the financial resources to pay the legal bill in full if it is contracted to be paid in installments.
In most places in the U.S., a person can easily buy a 3 bedroom, 2 bath house, with attached 2-car garage, in a safe middle-class suburban neighborhood, for what defending this case will probably cost TH, if she becomes a defendant. Gosh, in some places, a person can buy a nice car, along with the house.
I forgot to add that if convicted, especially of murder one, the defendant will appeal (it is required in some states, don't know about Oregon). A private attorney will charge about $50,000 for that, less if he is hungry.
Thank heavens we have government-paid attorneys for indigent defendants in the U.S. I mean that sincerely.