Who Murdered Greg Fleniken?

On the morning of September 16th, 2010, Greg Fleniken's body is found in his hotel room. Police are puzzled - they cannot find any motive for his murder and no explanation for his strange internal injuries. Greg’s wife, Susie turns to a private investigator in order to crack the case...and he does, revealing a series of truly stupifying events.

Sources: 

1) https://www.vanityfair.com/culture/2013/05/true-crime-elegante-hotel-texas-murder 
2) https://abcnews.go.com/US/caused-mans-mysterious-death-texas-hotel-room/story?id=20656854
3) https://kpel965.com/greg-fleniken-death-true-crime-mystery-body-in-room-348-vanity-fair/
4) https://www.beaumontenterprise.com/news/article/wife-of-man-found-dead-at-mcm-elegante-proceeds-4725451.php
5) https://www.legacy.com/us/obituaries/theadvertiser/name/gregory-fleniken-obituary?id=9169857