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We present near-infrared observations of the environments around threeradio-loud sources (MG1 J0442+0202, 3C 068.2, and MS 1426.9+1052) at redshiftsz=1.10,1.57, and 1.83 (respectively), that are surrounded by near-infraredgalaxy overdensities. Overdensities with respect to field counts were found tobe significant up to 19-sigma, with twelve times the expected number ofgalaxies within the inner regions of the densest proto-cluster. Color-magnituderelations are constructed in K_s, J-K_s, with each candidate cluster exhibitinga feature consistent with the beginnings of a red sequence. Galaxy models basedon the redshift of the radio source are used to compare expectedcolor-magnitude relations for a given formation epoch with the observed redsequence of each candidate, and are found to be consistent with an old (z_f >5) formation epoch for a few bright, red galaxies on the red sequence.

Three candidate clusters around high redshift radio-loud sources: MG1 J04426+0202, 3C 068.2, MS 1426.9+1052