Remembering Robin Williams on What Would Have Been His 64th Birthday

Today would have marked Robin Williams' 64th birthday.

Nearly a year since he was found dead inside his California home, the actor and comedian is still greatly missed.

Williams' first starring role was manic alien Mork from Ork, in the hit TV show Mork & Mindy in 1979, launching his hugely successful career. In 1998, he won Best Supporting Actor for his role in Good Will Hunting at the Academy Awards.

Film critic Leonard Maltin, who knew Williams well, remembered a performer dedicated to his craft.

He told INSIDE EDITION: "That first time I met him he was 'on.' From the moment he walked into the interview room. He knew when to cut the clowning and be serious in talking about the subject matter of the film."

Read: 'I Remember Robin:' 'Patch Adams' Co-Star Says She Will Never Forget Robin Williams

But there was plenty of turmoil in Williams' life. He was married three times. His second wife, Marsha Garces, had worked as a nanny for his first-born son.

Williams waged a lifelong battle against drug and alcohol addiction. He joked about it on The Daily Show last year, saying: "I was on everything but skates! Yes, I went to rehab in the wine country, just to keep my options open!"

On a serious note, he discussed the rehabilitation process with Larry King in 2007.

"People start the process of just saying no, and being among others, and learning that you're not alone and working on giving up," said Williams.

King asked, "Do you lose your sense of humor?"

"No. You find it," replied Williams.

Before his death, Williams suffered from depression, and he underwent open heart surgery in 2009, a potentially lethal combination.

Read: Robin Williams - His Final Days

He was found dead, age 63, inside his home in Tiburon, California on August 11, 2014 after taking his own life.

After his death, his widow revealed that he had been diagnosed with Parkinson's and toxicology reports found he had antidepressants, caffeine and a Parkinson's disease drug in his system.

Following his death in August 2014, fans placed flowers and a sign at the Mork & Mindy house. In Boston, they left loving messages at the bench where he consoled young Matt Damon in Good Will Hunting.

At Caroline's Comedy Club in Midtown Manhattan, people left photos and flowers remembering Robin Williams, who used to perform standup at the club.

Williams had been preparing to star in a sequel to Mrs. Doubtfire at the time of his death, and four of his movies were set to be released posthumously: There are four completed Williams films expected to be released posthumously: Night at the Museum: Secret of the Tomb, Merry Friggin' Christmas, Boulevard and Absolutely Anything.

He left behind his wife Susan and three children.