Patrick Mahomes Sr. is back behind bars, but he has not been accused of further wrongdoing -- TMZ Sports has learned he's simply begun serving his sentence for his most recent DWI conviction.
A Smith County jail official tells us ... the father of NFL superstar Patrick Mahomes was booked on Tuesday afternoon at around 4:53 PM and took a new mug shot. He's now not expected to be released until Halloween.
Of course, the 10-day stint in the slammer was all planned .