The reason WWE Hall of Famer Booker T wasn't on Monday Night Raw last night was because he had just undergone surgery.
Over the weekend there was news that Booker had been hospitalized, but there was no further information available. Well, according to PWInsider.com, he had surgery on his elbow. He also posted this on Twitter:
#BREAKING July 30th, 2016: The Spinnaroonie is officially.... RETIRED!— Booker T. Huffman (@BookerT5x) July 31, 2016
The reason he posted that is because his surgery is due to him tearing his triceps when performing the move after his induction into the WWE Hall of Fame in 2013.
The assumption is that Booker T will be back next week for his regular commentary duties.