Not in the BBC article:<p>"Second death linked to potential antibody treatment for Alzheimer’s disease<p>Woman’s brain hemorrhage while receiving Eisai’s widely heralded lecanemab heightens concerns overs its safety 27 NOV 2022•8:00 PM•Science<p>"Rudolph Castellani, a Northwestern neuropathologist who studies Alzheimer’s and conducted an autopsy at the request of the patient’s husband, called the case “very dramatic.” The report, co-authored by Castellani, concluded that the woman, like the other person whose death was linked to lecanemab..",<p><a href="https://archive.ph/FkYss" rel="nofollow">https://archive.ph/FkYss</a><p><a href="https://archive.ph/nye78" rel="nofollow">https://archive.ph/nye78</a>
It's far from clear that this is the "root cause". There is a good chance any therapeutic effect goes away after larger trials, like every single other drug targeting the same mechanism so far.
This disease is just absolutely devastating; I remember reading over the past couple years how the connection between protein buildup and alzheimers was being questioned more in the research. When a momentous breakthrough is a 25% delay in symptoms - you know things are bad.