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Robin Williams, who died听Monday听in what police are calling a suicide, had a long history of depression and addiction, according to those nearest the comedian.

Now, as friends and fans alike struggle to understand what drove the 63-year-old star to take his own life, many in the field of mental health say the discussion has opened an important window on a problem that is often听under-treated due to fear of cultural stigma.

鈥淒epression is a growing problem,鈥� says听Carla Sofka, professor of social work at Siena College in Loudonville, N.Y. The Centers for Disease Control recently identified depression as a serious and growing problem, while the US military has sounded an alarm at the increasing incidents of depression and suicide听by both active duty and veteran听personnel.

鈥淭his discussion听around Robin gives people permission to talk about听something that they otherwise might be too afraid to discuss,鈥� Professor Sofka says.

Twitter, Facebook, and other social media sites are awash in such discussions, points out Sofka, who studies the relationship between celebrity and mental health issues.听

She notes that both celebrities and private individuals are opening up about their struggles with depression and听suicidal thoughts. 鈥淭here is this cultural moment in which it听is suddenly safe to talk about these things,鈥� she says, even celebrities with more to lose in terms听of public reputation.

鈥淭witter has been very active including several conversations about the crippling nature of depression,鈥� she says. An example of the celebrity dialogue emerging in social media was the Twitter feed from Dave Foley of 鈥�Kids in the Hall鈥� fame and听more recently a guest role on 鈥�Hot in Cleveland,鈥澨齣llustrating that success does not always bring happiness.

Often, however, the individual most at risk is least likely to reach out in ways that might help, points out Sheila Hunt, director of community education for Pacific Grove Hospital, a treatment facility in Riverside, Calif.听

鈥淭hey are afraid of losing a job, or what friends might think,鈥� she says, so they ignore or听hide it from those close to them.

鈥淢any people will go to a doctor for a physical听sickness or other medical issue, but they are much less likely to seek treatment for mental health issues,鈥� she says.

鈥淭hat鈥檚 why we need more education about the听warning signs for people around the one that might be in trouble,鈥� she notes, pointing to everyone from friends and family to teachers and听ministers. Behavior to watch for includes sudden changes such as giving away prized possessions to friends or talk of 鈥渏ust wanting to go to sleep and never wake up,鈥� says Ms. Hunt.

Such detection can be more difficult with an individual such as Williams, who has听wrestled the twin demons of depression and听addiction throughout his career.

Many听assumed he had a handle on the challenges he faced, particularly as he had just recently returned听from a stay in a Minnesota rehab clinic. Nonetheless, some friends suggest they began to see signs of听new challenges to his mental health. Friends who saw听Williams in the months leading up to the suicide say they noted a change in his behavior, particularly after his CBS sitcom, 鈥淭he Crazy Ones,鈥� was canceled in May.

In the听Los Angeles Times听Wednesday,听longtime friend and fellow comic听Steven Pearl said he鈥檇 seen听Williams during the summer and was worried.听

"You could just tell something was off," Mr. Pearl said. "He seemed detached. It's hard to explain. He didn't seem like his usual self. My fianc茅e and I were like, 'Is he OK?' I didn't know it would get this dark."

Indeed, publicly at least, Williams appeared to have his challenges under control. According to听a publicist statement reported in the L.A. Times,听Williams checked himself into the rehab facility to "fine-tune and focus on his continued commitment" to his sobriety.