Ronnie Magro Attacks Jen Harley With a Knife, Gets Arrested and Tased By Cops

Strolling through Beverly Hills on Thursday, Ronnie Magro and Jen Harley assured a TMZ cameraman that all was well in their relationship, and they'd finally put the drama behind them.

Within 12 hours, however, Ronnie was in police custody following a violent altercation with Harley.

According to TMZ, cops arrived on the scene in response to several 911 calls indicating that Jen was "in distress."

Fearing that the couple's 1-year-old daughter, Ariana, might be in danger, police broke down the door with a battering ram.

And that's when the situation really got out of hand.

Take a look:

1. How Quickly Things Change

This was Ron and Jen in Beverly Hills on Thursday, assuring TMZ that all was well and that they had never been happier.

2. All Good!

Ronnie told the pap that "everything's good" in his relationship with Harley, adding that the couple's strategy for coping with the negative press around their relationship is to "just ignore everybody."

3. Ron-page

At 2:30 the following morning, however, amid reports of a violent altercation within the residence, police were called to the Air BnB Jen and Ronnie were renting

4. Unforgivable

Insiders say Magro stands accused of slapping and punching Harley during a heated argument.

5. A Chaotic Scene

Fearing that the couple's daughter might be in danger, police forcibly entered the residence.

6. Oh, No

It's unknown who called 911, but they described an appalling scene in which Ronnie chased Jen with a knife while she held Ariana in order to protect the baby.

7. Erratic Behavior

When police arrived, Ron had dropped the knife, but was now hiding in a closet with Ariana.

8. Rahn, Stop

Cops forced their way into the closet and were able to usher Ariana to safety. But Ronnie still refused to come peacefully.

9. Last Resort

That's when police decided to rase Magro in order to subdue him.

10. It Worked

Fox 11 LA reports that a semi-conscious Magro was led from the scene on a gurney and loaded into an ambulance.

11. Awaiting Charges

Police tell TMZ that Magro will be arraigned as soon as doctors give the go-ahead.

12. Off the Wagon

Jen told police that Ronnie had been doing cocaine, which may help to explain his erratic behavior.

13. Makes Sense

Obviously, that's no excuse for the appalling way in which he behaved, but it serves to explain how Ronnie wound up in such a troubling state.

14. Progress Made ... And Lost

Recognizing that his substance abuse had spiraled out of control, Ronnie checked himself into rehab earlier this year.

15. The Relapse

At one point, he had six months of sobriety under his belt. Sadly, it didn't last.

16. Not Even Hiding It

Last month, Ronnie was spotted drinking with a friend at the MTV Video Music Awards.

17. The Situation

Mike credits his reformed friend Mike Sorrentino with helping him to get sober. Mike got out of federal prison last month, but has not commented on Ronnie's relapse.

18. A History of Violence

Sadly, this is far from the first time that an argument between Ronnie and Jen has devolved into violence.

19. Sad State of Affairs

Both parties have been arrested for domestic battery over the course of their relatively short relationship.

20. What a Drag

In perhaps the most infamous incident, Harley dragged Magro with her car, leaving him hospitalized.

21. On and Off

The couple has broken up and gotten back together numerous times over the course of the past year.

22. No More Shore For Jen

On Thursday night's episode of Jersey Shore Jen re-entered Magro's life following an invitation from his roommate, Jenni Farley.

23. The Breakup Speech

Ronnie poured his heart out to his roommates, opening up on all the low points, the fights, and the destructive behavior that have defined his tumultuous time with Harley.