'Heroes' Star Greg Grunberg Reveals Medical Diagnosis

Greg Grunberg might look different these days compared to his Heroes era and he's telling fans why.

The 58-year-old actor had people reaching out to him to ask if he was OK. That's because he's sporting a bald look these days and some of his followers were concerned that he was sick. Grunberg set the record straight on his YouTube channel on May 7 and revealed the reason why he looks different right now.

"First of all, I want to thank everybody who's like asking if I'm OK, you know, 'What's going on?