Michael McKean calls Penny Marshall "my friend, my coach, my comedy playmate"

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After tweeting "I don't know what to say" upon learning of the death of his Laverne & Shirley co-star on Tuesday, McKean tweeted his thoughts nearly 24 hours later. "Let me put it this way: Penny was my friend, my coach, my comedy playmate," he tweeted. "I was awed by her clarity and her phenomenal instincts. She found the love at the center of the hurt and somehow found the funny along the way." ALSO: Jay Leno recalls playing Marshall's love interest on Laverne & Shirley.