That's not fishy at all.
Well, the true story could go either way, but a mildly-moderately demented person might well drive away, forgetting why they were there and who they were with.
It could be that the “inherited property” was barren or swampy and Taliaferro bailed out to avoid insulting his new wife.
APB on the rental car, cell phone movements, etc. Modern Forensics should solve this soon.