Doriano Romboni, a renowned Italian motorcycle racer, died on Saturday after falling from his bike and being struck by another racer in a practice session at Sic Supermoto Day near Rome.

While clinging to his bike after riding on the grass, the 44-year-old Lerici native swerved back onto the track and was struck by former Italian champion Gianluca Vizziello. Romboni was flown via helicopter to a hospital south of Rome following the crash, and the session was immediately stopped. He was reported dead within three hours.

Romboni, the father of three children, was participating in an event for fellow Italian racer Marco Simoncelli, who tragically died in 2011 at the Malaysian Grand Prix. 

Romboni's nine-year Grand Prix career included six victories, and 22 trips to the podium. He first raced in 1989, and rode for Honda, Aprilia, and MuZ at the 125cc, 250cc, and 500cc levels.

"Grew up watching him when I was a kid, such a great rider," said American former world superbike champion and MotoGP race winner Ben Spies on Twitter. "Prayers to his family and friends."

What looks to be a photo of the incident can be viewed here at Italian newspaper Il Messaggero.

The video below shows the same picture of what is supposedly Romboni lying on the track, and later a picture of paramedics attending to him.