The cast of Blue Bloods is paying respects to their late costar Treat Williams, who died in a motorcycle accident on Monday at age 71.
Tom Selleck, who plays NYC police commissioner Frank Reagan on the long-running CBS crime drama, was a close friend of Williams' in real life.
"It has been said that we are all just passing time and occupy our chair very briefly," Selleck, 78, wrote in a statement to PEOPLE. "My friend Treat was aptly named and occupied his chair so well.
I will miss him but I will not forget him. Well done, my friend."
Bridget Moynahan, who plays Erin Reagan on the series, described Williams as an "actor's actor" and an "absolute pleasure" to have on set.
"He was a role model off screen as well," Moynahan, 52, wrote in a statement to PEOPLE. "His love and devotion to his family was one for all to admire. We lost a good one, folks. RIP Treat."
Vanessa Ray, who portrays Eddie Janko-Reagan, remembered Williams fondly, sharing a story about the actor on Instagram.
"The first time I worked with Treat on @bluebloods_cbs at family dinner, he found out I was in Hair on Broadway," Ray wrote. "I said I was the 'Frank Mills' girl. He started singing. He knew every word. I did not. What an incredibly sharp, kind, beautiful artist.
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