>How does someone who is 90 have the tenacity to kill someone? Barring a new mental health issue which turned this guy murderous, he was probably not-a-nice-pe

>How does someone who is 90 have the tenacity to kill someone? Barring a new mental health issue which turned this guy murderous, he was probably not-a-nice-person earlier in life, thus already capable of (and perhaps never held responsible for) many earlier misdeeds. So, wild guess: step-daughter declared intent to reveal his prior crimes, to mom and/or authorities. Then, step-father kills to keep his secrets.