It was Lewy Body Dementia. He had periods of lucidity and in one of those decided that he no longer wanted to live as a prisoner in his own body, and a burden to his family because for all intents and purposes his life as a functioning human was over.
Honestly his entire circumstance is a shining example of why we need a death with dignity law.
2015 Ford Focus ST
Traded in my 11 WRX for it after Subaru tried to dick me around on a warranty claim. It’s got 128k on it now and it’s been rock fuckin solid dependable outside of the gas tank sucking itself inside out lol. Ford handled that.