March 1, 2015 10:26 AM EST

William Shatner “feels really awful” that he can’t make his Star Trek costar’s funeral Sunday.

Leonard Nimoy died Friday morning in Los Angeles at age 83 after battling chronic obstructive pulmonary disease.

Shatner, 83, took to Twitter Saturda to say that he’s in Florida appearing at the Red Cross Ball and won’t be able to make it back in time for his friend’s funeral.

The actor asked people to come together and help him celebrate Leonard’s life on Sunday and remember his legacy.

“I loved him like a brother,” Shatner said in a statement to PEOPLE. “We will all miss his humor, his talent, and his capacity to love.”

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