X2, the beleaguered roller coaster at Six Flags Magic Mountain near Los Angeles that has been at the center of numerous lawsuits, including at least two wrongful death cases, is permanently closing, the theme park’s operator said on Tuesday. The ride, which tops out at about 200 feet and reaches speeds of up to 76 miles an hour, has not operated since July, amid a flurry of complaints accusing Six Flags and S&S Worldwide of failing to warn riders about the risks.

Riders experienced up to four times the force of gravity on X2, which featured multiple inversions and twists and was classified as a “fourth-dimension” roller coaster because of the way its seats were designed. The seats rotated independently as the train traveled along the track, spinning riders as much as 360 degrees. Its design spawned intense criticism over the years, with lawsuits linking it to cerebral hemorrhages and other traumatic brain injuries.

More than 16 million people rode the roller coaster since it was renamed X2 in 2008 after a redesign, according to Six Flags. The original ride opened as X in 2002. In a blog post, Brian Oerding, the president of Six Flags Magic Mountain, said that the ride was being retired.

“While X2 consistently passed a multitude of safety tests, we have decided to close the ride because we believe it’s the right thing to do,” Mr. Oerding said. The roller coaster’s decommissioning came eight days after three people sued Six Flags and S&S Worldwide, claiming they suffered catastrophic brain injuries after riding X2.