Responsible for the separation of the host daughter cells at the end of cell division and participates in the liberation of progeny bacteriophage into the medium. Degrades cell walls containing either choline or ethanolamine. Hydrolysis of (1->4)-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues in a peptidoglycan and between N-acetyl-D-glucosamine residues in chitodextrins. The C-terminal domain could be responsible for the substrate recognition. Belongs to the glycosyl hydrolase 25 family.