He left a family member's residence in Shawnee, Oklahoma headed to a job in Texas (Midland/Odessa area) driving a company vehicle. As seen in the included case photos.

Last phone conversation he stated he was crossing a river.

***UPDATES***
7-12-2023 https://www.theintelligencer.net/news/top-headlines/2023/07/ex-business-partner-of-victims-in-unsolved-double-homicide-reported-missing-in-oklahoma/
Specifically, "According to Senior Deputy Thomas Gilliland with the Harris County Sheriff’s Department in Texas, Andrew Isaac Griffin is currently being held on a misdemeanor charge out of Oklahoma."

10-11-2023 https://www.timesleaderonline.com/news/local-news/2023/10/former-business-partner-of-strussions-found/
Specifically, "According to the Pottawatomie County Sheriff’s Office in Oklahoma, law enforcement in Harris County, Texas, informed them that Andrew Griffin was located safe and had been taken into custody for outstanding warrants out of LeFlore and Oklahoma County.

10-17-2023 https://www.newson6.com/story/652f48adc5dd797cc9ee22a3/missing-oklahoma-man-arrested-while-de-boarding-international-flight
Specifically, "Four months later, Oct. 8, investigators located Griffin at Houston's George Bush Intercontinental Airport. According to Houston Police, Griffin was arrested as he de-boarded an airplane as it arrived from Honduras."