"NCIS" star Pauley Perrette is "worried" about fan reaction to her "sad" exit from the show.
Tuesday's episode will mark Perrette's last appearance on the police procedural.
"I'm so worried about you guys for Tuesday's episode of the #GoodbyeAbby," Perrette told her 757,000 followers.
"It's sad, But I hope hope hope you will all watch," she said.
Perrette, whose character was mugged during last week's episode, told USA Today fans will need "a couple boxes of tissues" Tuesday.
"It's a heavy episode," the star said. "I gave it all I had emotionally, but I really wanted to give respect to the fans and to Abby and her legacy."
"I believe in God and the universe so firmly, and it just suddenly became blindingly apparent that now was the time," the actress said.
"NCIS" was renewed for a 16th season in April.
The series co-stars Mark Harmon, David McCallum, Rocky Carroll, Brian Dietzen and Emily Wickersham.