We present the first results on 3-particle $Deltaeta$-$Deltaeta$ correlations in minimum bias $d$+Au, peripheral and central Au+Au collisions at $sqrt{{it s}_{NN}}$ = 200 GeV measured by the STAR experiment. The analysis technique is described in detail. The ridge particles, observed at large $Deltaeta$ in dihadron correlations in central Au+Au collisions, appear to be uniformly distributed over the measured $Deltaeta$-$Deltaeta$ region in 3-particle correlation. The results, together with theoretical models, should help further our understanding of the underlying physics of the ridge.
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