Dolores died in January last year (18), leaving fans and her bandmates devastated.
The rest of the Irish group completed one final album, "In the End", using previously recorded vocals, which they released on Friday, April 26, and now the "Linger" hitmakers are considering one final show in lieu of a tour after vowing to split and not perform without their much-loved singer.
Guitarist Noel Hogan told Reuters the band is "gutted" not to be able to play the new songs live, adding the rockers may regroup for a show with guest vocalists.
"A few people have said to us about maybe even doing a one-off, where you have different vocalists... as kind of guests of ours," he explained. "A year ago that's definitely something we weren't going to entertain but I don't know."
"I think it's something we need to go away and take time off for the summer and have a think about."
O'Riordan's death at the age of just 46 was ruled a tragic accident - she drowned in the bath while intoxicated with alcohol.