William Shatner is explaining his decision to miss “Star Trek” co-star Leonard Nimoy‘s funeral over the weekend, saying the Red Cross event he attended was an important celebration of life.

“My understanding is mourn the dead but celebrate life,” Shatner said in an interview with Inside Edition. “I chose to celebrate life by going to the Red Cross gathering in Palm Beach, raised a lot of money for the Red Cross.”

Also Read: William Shatner Arrives in LA, Won’t Discuss Leonard Nimoy Funeral (Video)

The actor had come under fire Friday when he revealed he would not be able to attend Nimoy’s funeral in Los Angeles due to the Red Cross commitment. The New York Daily News dubbed Shatner “Captain Jerk” on its front page Sunday, while a New York radio host suggested Shatner’s Priceline endorsement deal would make scoring a flight from Florida to L.A. easy.

“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,” Shatner wrote in a series of tweets as he blasted his critics, including a reporter from the Louisville Courier-Journal and the New York Daily News.

Also Read: William Shatner Blasts Critics, Defends Absence From Leonard Nimoy’s Funeral

Shatner asked the attendees at the Red Cross event to remember Nimoy, who played Spock opposite Shatner’s Captain Kirk on the iconic 1960s sci-fi series, as well as another friend who recently died.

“[T]ake a moment to remember them, but also remember them by doing good deeds,” Shatner said. “And those good deeds will be remembered long after any other kind of memorial.”

Inside Edition is distributed by CBS Television Distribution.