The shocking story of how Hollywood A-Lister Jon Hamm violently hazed a young fraternity pledge has resurfaced amid calls for him to be canceled.

The revered Mad Men star is currently riding high following an SNL appearance and a new hit show on Apple TV.

But amid the adulation, shocking allegations of abuse from his time as a rowdy frat boy continue to plague the actor.

The Golden Globe winner was one of seven Sigma Nu brothers who tormented a young pledge at the University of Texas at Austin.

Freshman Mark Sanders was hit so hard during the warped 1990 initiation that he suffered a fractured spine and nearly lost a kidney.   

Hamm didn’t comment on the story when it emerged in 2015. In 2018, he summarized it as a ‘bummer of a thing that happened’ in an interview with Esquire. 

In the debut episode of her new show podcast The Nerve, Daily Mail columnist Maureen Callahan revisited the story – and called for Hamm to face a reckoning. 

She also took aim at Hamm’s ‘limited acting range’ and Hollywood sycophants who she claims are too enamored by his good looks to ever pull him up over his past behavior.

Jon Hamm, pictured in the back row, was identified as a ringleader and arrested in 1993 but an assault charge was dismissed
+9
View gallery

Jon Hamm, pictured in the back row, was identified as a ringleader and arrested in 1993 but an assault charge was dismissed

Hamm was accused of carrying out horrific abuse against a Sigma Nu pledge while a frat boy at the University of Texas at Austin in the 1990s
+9
View gallery

Hamm was accused of carrying out horrific abuse against a Sigma Nu pledge while a frat boy at the University of Texas at Austin in the 1990s

Callahan detailed l the horrific abuse Hamm and others allegedly inflicted on Sanders, including a brutal beating when the pledge forgot to address the actor by his nickname, ‘MC Hammer’.

‘He marches these two little pledges upstairs, where they meet two other frat boys with a paddle,’ Callahan states.

‘This isn’t like a ping pong paddle. This is what the victim describes as a two-handed wooden paddle that was at least a foot long. So that’s solid wood. They begin to beat Mark Sanders. He says, ‘very hard, rearing back.’

‘These aren’t love taps… He’s on his right side, he’s on his left side. Then, at a given point, Jon Hamm, according to this transcript, takes the paddle and the victim describes Jon Hamm rearing back, and ‘He hits me right over my right kidney. I mean, square over it. Good, solid hit. And that stood me up’.’

But the ordeal allegedly did not end there and Sanders described how his underwear was aggressively wrenched from inside his trousers as part of ‘sawing’.

‘This is what he said. ‘The more they pulled, the way they were pulling was one would be pulling up. They were pulling like it was sawing and it was hurting and it hurt.’

‘He doesn’t even know how long they continue doing that,’ Callahan said.

She Hamm was described as an ‘officer of the fraternity’ and said that Sanders recalls him being with him all night.

This included when he was forced into a dirty confined space called ‘the pit’ where he was forced to do pushups.

Freshman Mark Sanders was hit so hard during the warped 1990 initiation that he suffered a fractured spine and nearly lost a kidney
+9
View gallery

Freshman Mark Sanders was hit so hard during the warped 1990 initiation that he suffered a fractured spine and nearly lost a kidney

Sanders (pictured in 2015) subsequently withdrew from the university and sought counselling to cope with the shameful episode which resulted in a police inquiry and the fraternity chapter being disbanded.
+9
View gallery

Sanders (pictured in 2015) subsequently withdrew from the university and sought counselling to cope with the shameful episode which resulted in a police inquiry and the fraternity chapter being disbanded.

Hamm left the school and pursued a career in acting. He is shown, center, wearing a puffer jacket and baseball hat
+9
View gallery

Hamm left the school and pursued a career in acting. He is shown, center, wearing a puffer jacket and baseball hat

‘His kidney is so damaged that he can barely breathe now he’s got to do push ups,’ Callahan raged.

She then described how Hamm allegedly took out a lighter and torched the belt loop of the pledge’s jeans which caught fire.

‘”I tried to put out the fire immediately.” Question: “With your hand?” Mark: “Yeah, with my hand, but he knocked my hand away”,’ Callahan reads from the transcript.

‘”And I was kind of panicking, because I was wearing a cotton t-shirt”. He could feel the heat.

‘”I actually tried to put it out with my hands, and Jon Hamm wouldn’t let me. He made me blow it out with my mouth”.’

She continues to narrate the transcript which details Sanders’ allegation about how Hamm took a claw hammer, ‘hooks it under Mark Sanders’ genitals, and drags him around the room by his privates for about a solid minute’.

Sanders subsequently withdrew from the university and sought counselling to cope with the shameful episode which resulted in a police inquiry and the fraternity chapter being disbanded.

Hamm, a sophomore, was identified as a ringleader and arrested in 1993, long before he became one of America’s most recognizable actors playing boozy advertising exec Don Draper.

Hamm has been riding high lately thanks to an SNL appearance and a hit AppleTV show
+9
View gallery

Hamm has been riding high lately thanks to an SNL appearance and a hit AppleTV show

An assault charge was dismissed, however, and he completed a period of probation instead of receiving a conviction for hazing.

Callahan also took aim at Hamm’s famous friends’ fawning with her trademark acidity and suggested they’re former ugly ducklings thrilled to receive attention from an all-American jock.

‘The new Interview magazine, he’s interviewed by his good friend Tina Fey in which they just tongue bathe each other.

‘[…[ And I always wondered about people like her like Kirsten Wiig you know who sort of like helped John Ham enter that SNL little clique, that comedy world.

‘My theory about them is that they were never the homecoming queens They were the comedy nerd girls who kind of didn’t fit in.

‘And a guy like John Ham comes along and pays them some attention and their knees buckle. They can’t believe it.

‘They can’t believe a guy this hot would look twice at them And so they’re doing dirty work for him, in my opinion.’

But it was not just the violent episode that Callahan took issue with as she accused Hamm of ditching his long term girlfriend Jennifer Westfeldt once he found fame.

Callahan also accused Hamm of ditching his long term girlfriend Jennifer Westfeldt once he found fame
+9
View gallery

Callahan also accused Hamm of ditching his long term girlfriend Jennifer Westfeldt once he found fame

Hamm has since married Anna Osceola, who he met while filming Mad Men
+9
View gallery

Hamm has since married Anna Osceola, who he met while filming Mad Men

‘He gets with a minor actress on Mad Men, practically an extra. So someone whose talent level is never going to eclipse his,’ Callahan said of Hamm’s now-wife Anna Osceola.

‘She’s half his age. He marries her, and he starts giving interviews about how he thinks he wants children now, which I’m sure Jennifer Westfeldt is so happy she sacrificed so much of her own dreams and life ambitions for that piece of s**t.’

Hamm previously addressed the hazing allegations against him in a 2015 interview where he claimed Sanders’ account had been ‘sensationalized’.

‘I wouldn’t say it’s accurate. Everything about that is sensationalized. I was accused of these things I don’t…

‘It’s so hard to get into, I don’t want to give it any more breath. It was a bummer of a thing that happened.’

Daily Mail has contacted Hamm’s representatives.