William Shatner sent out a series of Tweets on Saturday expressing his grief over the loss of one his "dearest friends," Leonard Nimoy. Sadly, due to a prior commitment that poses a scheduling conflict, Shatner is unable to attend Nimoy's funeral on Sunday. "I am currently in FL as I agreed to appear at the Red Cross Ball tonight. Leonard's funeral is tomorrow. I can't make it back in time," heexplained, adding in another Tweet, "I feel really awful. Here I am doing charity work and one of my dearest friends is being buried."