A steel structural member is secured to a vertical cast concrete member or wall by a connector system including a fabricated steel receiver embedded within the wall. Embedded anchors are attached to the receiver which has upper and lower front wall portions flush with the concrete wall and define a front opening. A support bracket has a horizontal plate attached to the beam and a vertical plate which fits through the front opening within the receiver. The bracket is attached to the beam which is then elevated, and the vertical plate is inserted through the opening into the receiver. The beam and vertical plate are then shifted downwardly until opposite upper and lower edge portions of the vertical plate are blocked by the front wall portions of the receiver. In the illustrated embodiment, the front opening and vertical plate are generally rectangular with the opening wider than the plate.