William Shatner couldn't make it to Leonard Nimoy's funeral Sunday so he gave his longtime co-star and friend a send-off on Twitter.

Shatner, 83, reflected on Nimoy's life along with fans, sharing experiences and anedotes on and off the "Star Trek" set. Nimoy, 83, who played Mr. Spock in the TV series and subsequent movies, died Friday from chronic obstructive pulmonary disease. Shatner, who played Captain James T. Kirk, said he couldn't attend the funeral because of a charity engagement in Florida.

"So let's spend some time tomorrow celebrating Leonard's life and remembering the man," he tweeted.

Shatner, who used the hashtag #leonardnimoy, answered fans questions like, "What was he life off set?" "Intelligent, insightful, just a precious gem of a man," and praised him for being a "an amazing uncle to his daughters," who did make the services.

The actor struck back at criticisms over not making the funeral, reiterating that he committed to the Red Cross event in Florida and he couldn't get a flight back.

"One of the other misconceptions seems to be that folks think flights to LAX occur all night long," he tweeted.