  Based on a rigorous QED approach a theoretical analysis is performed for the
two-photon transitions in heavy He-like ions. Special attention is paid to the
interelectronic-interaction corrections to the decay rates that are taken into
account within the two-time Green-function method. Detailed calculations are
carried out for the two-photon transitions 2^1S_0 -> 1^1S_0 and 2^3S_1 ->
1^1S_0 in He-like ions within the range of nuclear numbers Z=28-92. The total
decay rates together with the spectral distributions are given. The obtained
results are compared with experimental values and previous calculations.
