A drunk-driving dad was beaten to death just hours after being booked into a Pennsylvania prison to start his 90-day sentence, according to authorities.

Erick Gainer, 41, was found badly battered with a swollen brain in his cell in Cumberland County on Oct. 23 after a fellow inmate reported hearing him screaming “Stop!” and “Help! What did I do to you?,” according to court docs obtained by the Patriot-News .

“It wasn’t even 24 hours from when I dropped him [off at prison] when I got the phone call from the warden,” Gainer’s grieving girlfriend, Tessa Shorb, told WHP of the “biggest dorky dad-joke teller ever.”

The father of one was sentenced on Oct. 21 for DUI for a November crash in which his car veered down an embankment in Silver Spring Township. The bartender had no reason to f

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