As we prepare to ring in a new year, RadarOnline.com takes a look back at the celebrities we lost in 2011 who made their memorable mark on the world.

Apple founder Steve Jobs died at 56 on October 5 after a long battle with pancreatic cancer. The tech guru leaves a vast legacy in his industry over the better part of four decades, listed as the inventor of household items such as iPod, iPhone and iPad, among others. He was also the driving force behind companies like Pixar and Atari.

Legendary newsman Andy Rooney died November 4, just weeks after his 1097th and final weekly segment on the CBS stalwart 60 Minutes, capping off a 33-year run.

PHOTOS: Celebrities We Lost In 2011

Legendary fitness guru Jack LaLanne died Sunday at 96 at his Morro Bay, California home from respiratory failure connected to pneumonia, RadarOnline.com has learned.

LaLanne was one of the forefathers of the huge fitness movement, having hosted a TV workout show for more than 30 years. He’d also opened his own chain of spas, marketed workout equipment and continued preaching his passion of fitness into his golden years, joking in 2006: "I can't afford to die -- it would wreck my image."