I was 20, the following day friends and I piled into a car and drove to the city. We brought a floral bouquet to leave at the front gate - the crowds were unbelievable. Many tears, people singing, playing guitars… such a loss 
Two to three years later I was back at the Dakota, unbelievably doing John Lennon’s audit for NYSIF. Met with the accountant, I think it was an office in the Dakota’s basement (so long ago now). Sean came in, with I guess his nanny/babysitter. He ran around the office a bit, then left.
Very sad brush with fame.