Woman Decapitated Inches From Fiancé as Alleged Drunk Boater Launches Pontoon Over Their Vessel

A peaceful afternoon on Illinois’ Fox River became an unimaginable nightmare when a speeding pontoon boat allegedly driven by an intoxicated businessman slammed into a smaller vessel, killing former U.S. Marine Magdalena Jablonska within inches of her fiancé.

Now, the horrifying collision has triggered criminal charges and a legal battle over the events that allegedly transformed a recreational waterway into the scene of a deadly high-speed impact.

Jablonska, 49, was boating on the Fox River near McHenry, roughly 60 miles northwest of Chicago, when the collision occurred on July 25, 2026. Prosecutors allege Richard Stevenson, 45, was operating a roughly 30-foot pontoon boat at an extraordinary speed before striking the smaller Crownline carrying Jablonska and her fiancé.

The impact was catastrophic.

According to prosecutors, Stevenson’s pontoon entered a no-wake zone and struck the rear of the Crownline. The larger vessel allegedly traveled over the smaller boat, fatally striking Jablonska, who was sitting in the passenger area.

Authorities said she was decapitated during the collision.

Her fiancé, who was only feet away, survived and was transported to a hospital.

The sheer violence of the crash would have been difficult to comprehend from the calm shoreline only moments earlier.

Prosecutors say Stevenson’s pontoon was traveling at approximately 80 mph before the collision — an allegation that becomes particularly alarming because the crash occurred in a no-wake zone, where boat operators are expected to proceed slowly enough to minimize their wake.

Surveillance footage from homes near the river allegedly captured the pontoon traveling along the water before the crash.

One recording reportedly showed the vessel moving south earlier in the afternoon and then returning north roughly an hour and 45 minutes later. About a minute after it passed on the return trip, residents reportedly heard the collision.

Another recording captured the pontoon passing the area nearly two hours before the fatal impact.

But speed is only one part of prosecutors’ case.

Investigators allege Stevenson had been drinking before operating the boat.

Two passengers aboard the pontoon were later interviewed by authorities, according to prosecutors. They reportedly described Stevenson consuming multiple shots of Fireball whiskey during the day, with one passenger allegedly telling investigators that the pontoon reached approximately 80 mph.

Following the crash, Stevenson was taken to a hospital.

Prosecutors said a subsequent blood draw showed his blood-alcohol concentration at roughly .20, approximately two-and-a-half times the legal limit. Other reporting has placed the alleged reading slightly higher, but authorities have consistently characterized it as far beyond the permissible threshold.

Stevenson faces felony charges including reckless homicide and aggravated driving under the influence. A judge ordered him detained while the criminal case proceeds. The allegations remain accusations, and Stevenson is entitled to the presumption of innocence unless prosecutors prove the charges in court.

What prosecutors revealed about his driving history added another disturbing dimension.

Between 1997 and 2005, Stevenson accumulated a series of traffic-related cases that prosecutors said included three DUI arrests, three reckless-driving offenses, four misdemeanor speeding offenses and a fleeing-and-eluding-police charge.

Prosecutors also cited a 2023 misdemeanor speeding violation involving allegations that he drove 26 to 34 mph above the limit.

Assistant State’s Attorney Brian Miller used striking language while arguing that Stevenson should remain detained, describing him as a “ticking time bomb” whose history allegedly demonstrated the danger he posed.

The judge ultimately agreed that Stevenson should remain in custody ahead of further proceedings.

Witness accounts of what happened immediately after the collision make the story even more haunting.

The pontoon reportedly continued toward the riverbank after striking the smaller vessel and eventually came to rest near shore.

One passenger later told prosecutors that Stevenson was crying after the crash and saying that his life was over.

For Jablonska’s family, however, the consequences were far more permanent.

She was remembered not simply as the victim of a horrific boating collision but as a former U.S. Marine who had built a reputation for helping others.

Her brother, Marcin Jablonski, described her in a family fundraiser as someone who brought warmth wherever she went and whose instinct as a Marine was to assist people in need.

That personal history makes the circumstances of her death particularly painful.

She was not participating in some inherently extreme activity. She was enjoying an afternoon on the river with the man she planned to marry.

Then another vessel allegedly approached at tremendous speed.

There was virtually no meaningful distance separating an ordinary summer outing from catastrophe.

The case also highlights a danger that can be underestimated on recreational waterways: intoxicated boating can carry consequences every bit as devastating as drunk driving on a highway.

A large motorized boat is a powerful vehicle.

At high speed, its operator must process distance, direction, waves, other vessels and changing conditions rapidly. Alcohol can impair reaction time and judgment precisely when those abilities are most necessary.

No-wake zones exist partly because certain waterways demand even greater caution.

When high speed and alleged intoxication are combined, prosecutors contend, the consequences can become irreversible.

There is now a civil dimension as well, with litigation reportedly seeking accountability for the deadly collision. The criminal prosecution, however, will determine whether Stevenson is legally responsible for the offenses charged.

That distinction remains essential.

The horrific outcome is established.

The criminal allegations still must be proven.

But for Jablonska’s loved ones, no courtroom ruling can reverse what happened on the Fox River.

Her fiancé survived an impact that killed the woman sitting only inches away from him.

A summer afternoon became a crime scene.

And a former Marine whose family remembers her for helping others became the victim at the center of a case that delivers a brutal warning about speed, alcohol and responsibility on America’s waterways.

On land or water, a powerful vehicle placed in reckless hands can become lethal in seconds.

For Magdalena Jablonska, those seconds changed everything.