Walsh was placed on waivers for assignment to AHL Ontario, Elliotte Friedman of Sportsnet reports.
Walsh signed a one-year, two-way contract with the Kings on Monday.
Walsh was waived by Boston on Tuesday, according to Chris Johnston of TSN.
Walsh agreed to a one-year, two-way contract with Boston on Monday.
Boston obtained Walsh from New Jersey on Monday in exchange for Shane Bowers.
Walsh was reassigned to AHL Utica on Saturday.
Walsh was recalled to the NHL from AHL Utica on Tuesday.
Walsh penned a three-year, entry-level deal with New Jersey on Monday.