The decay K-S(0) --> pi ev has been observed by the CMD-2 detector at the e
(+)e(-) collider VEPP-2M at Novosibirsk. Of 6 million produced (KLKS0)-K-0
pairs, 75 +/- 13 events of the K-S0 --> pi ev decay were selected. The corr
esponding branching ratio is B( K-S(0) --> pi ev)=(7.2 +/- 1.4) X 10(-4). T
his result is consistent with the evaluation of B( K-S(O) --> pi ev) from t
ile K-L(0),(C) semileptonic rate and K-S(0) lifetime assuming Delta S =Delt
a Q. (C) 1999 Published by Elsevier Science B.V. All rights reserved.