Ashton Kutcher, other celebs Tweet reactions to Steve Jobs' death

10 of 30: "So sad about Steve Jobs...my heart goes out to his family and loved ones," Denise Richards wrote on Twitter, referring to the death of Apple co-founder Steve Jobs on October 5. The 56-year old computer entrepreneur and inventor had battled cancer in 2004 and underwent a liver transplant in 2009 after taking a leave of absence for unspecified health problems. (Pictured: Denise Richards appears in a promotional photo for the 2011 film, 'Cougars, Inc.') (StoneBrook Entertainment / Grindstone Entertainment Group)