The day after the party with the Tieflings. My A-button wasn't working, so I used the context menu to talk to people. Until I accidentally clicked on Attack instead of Talk.
Lakrissa was killed by Karlach who wasn't in my party and therefore not doing nonlethal attacks. And Halsin either died to fire damage still affecting him or you can't go nonlethal on him.
And Alfira of all people killed Lae'zel, after she was worn down by Zevlor.
I wonder if this will be relevant at all in act 2.
There's been at least a dozen times where I meant to switch party members and ended up attacking them instead. Really wish there was a confirmation click. I think I've had to hit a party member only one time ever because they were asleep or whatnot.