Robin Williams ' Fans are very excited about the impersonation of the deceased star by actor Jamie Costa. Costa posted a clip on his YouTube channel, titled ROBIN Test Footage Scene on Tuesday, showing a scene featuring himself as Williams and Sarah Murphree as Pam Dawber on the set of Mork & Mindy. The clip shows Dawber interrupts Williams as he scans the lines to break the news of comedian John Belushi's death - and shows Williams' reaction to the news. When Murphree tells Costa that Belushi was found dead that morning, Costa struggles to digest the news, insisting: No, I told you, I was with him. John is not dead, I 've been with him. was with him last night. Blues Brothers star Belushi has died at the age of 33 from a Cocaine and heroin overdose at Chateau Marmont in Los Angeles in 1982. Read more After Murphree warns Costa: I can't let what happened to him happen to you and a knock on the door signals that 'it's time for the pair to return to the set, Costa returns to reciting the lines - this time, with a pause in hi voice. Robin Williams: Remembering him on what would have been his 70th birthday The short film has left some viewers eager for a full biopic of Williams, who died by suicide in 2014 after battlingLewy body dementia. Who else had hoped Jamie would play Robin in a biopic since you saw his first impressions of Robin? One wrote. It's one thing to look like he's a person but that's how he looks like him and has his mannerisms and expressions which are so awesome. I hope this movie is made. I still feel his loss, said another. It 's absolutely amazing. Make this feature film and hire this man NOW! Wrote a third.