[VIDEO] Billy Crystal's Tribute to Robin Williams at 2014 Emmy Awards

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Actor Robin Williams Suicide Was Spontaneous, Not Planned !

Robin Williams did not plan his suicide ... in fact, hours before he hanged himself he was making plans for upcoming projects.

A confidante of Robin's who spoke with him the day before his body was discovered said they had a fairly lengthy discussion about several deals in the works and Robin was "completely engaged in the conversation."  

The source says Robin was asking lots of questions about the deals ... inconsistent with someone who planned on killing himself.

The confidante says there was nothing out of the ordinary during the conversation ... saying "He [Robin] was unhappy which he often was, but it was nothing unusual."  As for why Robin was unhappy, the source says Robin, like lots of other comedians, "lived in a dark place." 

We're also told no one in Robin's life -- including his wife or personal assistant -- had any idea suicide was looming. 

We're told the family believes whatever set Robin off on his fatal path occurred shortly before he cut, then hanged himself.

Wow is all I can say!

[VIDEO] Officials Revealed So Far- Robin Williams Death Was By Hanging

Investigators believe Williams, 63, used a belt to hang himself from a bedroom door sometime between late Sunday and when his personal assistant found him just before noon Monday, according to Marin County Assistant Deputy Chief Coroner Lt. Keith Boyd.

Boyd would not confirm or deny whether Williams left behind a letter, saying that investigators

Sad News: Actor Robin Williams Died At 63!

Oscar-winning actor and comedian Robin Williams has been found dead in his California home, and the Marin County Sheriff’s Office is investigating whether it was suicide.

He was 63.

Williams’ publicist would not confirm that his death