William Shatner is facing some backlash since announcing that he could not attend Leonard Nimoy’s funeral because of a commitment he made to a charity event in Florida. After the New York Daily News labeled Shatner “Captain Jerk” on its front page and others insisted that Shatner could have attended both events, the 83-year-old took to Twitter to fire back at his critics:

“@NYDailyNews: An early look at tomorrow’s front page. http://t.co/ZDjADxLW48 pic.twitter.com/ijdwAwDw14” I want to share this. Let’s discuss it

— William Shatner (@WilliamShatner) March 1, 2015

So my daughters Melanie and Lisabeth are attending Leonard’s services.

— William Shatner (@WilliamShatner) March 1, 2015

I chose to honor a commitment I made months ago to appear at a charitable fundraiser. A lot of money was raised. So here I am; tell me off.

— William Shatner (@WilliamShatner) March 1, 2015

.@toddschnitt @THR I must have missed your email about underwriting the arrangement and payment for this.

— William Shatner (@WilliamShatner) March 1, 2015

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

— William Shatner (@WilliamShatner) March 1, 2015

.@NYDailyNews You know what I find puzzling. The headline is horrible but the article contradicts it.

— William Shatner (@WilliamShatner) March 1, 2015

The actor invited his 2.11 million Twitter followers to remember Leonard Nimoy with a Twitter discussion on Sunday. He also released a statement expressing his grief. “I loved [Nimoy] like a brother,” Shatner said. “We will all miss his humor, his talent, and his capacity to love.”

Shatner and Nimoy starred as Captain Kirk and Mr. Spock, respectively, on the “Star Trek” television series and in multiple feature films together. Nimoy died Friday at his home in Los Angeles at the age of 83.