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Robin Williams, Norm MacDonald

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While Robin Williams' work has undoubtedly brought a smile to countless faces, the late actor has been even more revered for his kindhearted ways, touching the lives of everyone who came in to contact with the iconic comedian.

Former Saturday Night Live castmember Norm Macdonald is one of the few who was lucky enough to cross paths with the Mrs. Doubtfire star, and, in a series of heartfelt tweets posted on his page early Tuesday morning, he recalls his first meeting with Williams while paying tribute to the 63-year-old Oscar winner, who tragically took his own life on Monday.

For extensive coverage, tune in to E! News tonight at 7 and 11:30 p.m., followed by Live From E!

If you or someone you know needs help, please call the National Suicide Prevention Lifeline at 1-800-273-TALK (8255).