People who assist a suicide or euthanasia can have their own agendas. In Oregon, there is the Thomas Middleton case, in which legal physician-assisted suicide was part of an elder abuse fraud.[1 & 2]
Consider also People v. Stuart where an adult child killed her parent under circumstances that “dovetail[ed]” with the child’s financial interests. The Court stated:
How was it possible for Swango to go on for so long [?] [Author James B.] Stewart credits Swango's considerable gift for lying and manipulation. But the real fault rests, he argues, with medical authorities, . . . who, with some honorable exceptions, closed ranks in misplaced professional solidarity. They feared publicity. They feared lawsuits, not only by patients and their families but also by Swango. A snobbery of the professional class system asserted itself: Medical authorities tended to believe a doctor's word over nurses' eyewitness accounts.Footnotes
 See “Sawyer Arraigned on State Fraud Charges,” KTVZ.com, 07/14/11 ("Middleton deeded his home to the trust and directed [Sawyer] to make it a rental until the real estate market improved. Instead, Sawyer signed documents that month to list the property for sale, two days after Middleton died by physician-assisted suicide. The property sold in October of that year for more than $200,000, the documents show, and it was deposited into [accounts for Sawyer’s benefit]").
 See also: AP, "Former Bend real estate agent, husband plead guilty," 01/15/13; Barney Lerten, "State dropping Tami Sawyer fraud case" DOJ says prosecution would likely not add time behind bars," KTVZ.com, updated September 1, 2016.
 People v. Stuart, 67 Cal.Rptr.3d 129 (2007).
 Id., at 143.
 James B. Stewart, “Blind Eye: How the Medical Establishment Let a Doctor Get Away With Murder,” New York: Simon & Schuster.
 Lance Morrow, “Dr. Death: James B. Stewart tells the true story of a physician who is under investigation for killing patients,” The New York Times, August 29, 1999.