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The three-dimensional Ising spin-glass in zero field with nearest-neighbor interactions having a ± / distribution is studied by Monte Carlo simulations for samples of linear dimension L with 3 ^L ^20. Results for the probability distribution, PL(Q), of the spin-glass order parameter are analyzed by finite-size scaling. Data for T ^ 1.2 are consistent with a conventional phase transition at 7^ = 1.210.2. with exponents v = 1.3 ±0.3 and r)= -0.3 ±0.2. However, results at lower temperature indicate marginal behavior and suggest that the lower critical dimensional is close to three.

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