7 52. On November 6, 1998, the Commission informed the Court that in future, Claudio Grossman would act as its sole Delegate in this case, thus annulling the appointment in this capacity of John Donaldson. 53. On December 9, 1998, the Commission sent its definitive list of witnesses and expert witnesses for the case. 54. On December 14, 1998, the President summoned the State and the Commission to a public hearing to be held at the seat of the Court on January 28, 1999, in order to receive the statements of the witnesses and the reports of the expert witnesses proposed by the Commission. Furthermore, the President instructed the Secretariat to inform the parties that, as soon as this evidence had been received, they could present their final oral arguments on the merits of the case. 55. On December 28, 1998, the Commission presented the powers of attorney granted by Matilde Reyna Morales García, Ana María Contreras and Margarita Urbina Sandoval, next of kin of three of the victims. 56. On January 28 and 29, 1999, the Court received the statements of the witnesses and the reports of the expert witnesses proposed by the Commission and heard the final oral arguments of the parties in a public hearing on the merits of the case. There appeared before the Court for the State of Guatemala: Guillermo Argueta Villagrán, Agent; Dennis Alonzo Mazariegos, Deputy Agent; and Alejandro Sánchez Garrido, Advisor for the Inter-American Commission: Claudio Grossman, Delegate; Elizabeth H. Abi-Mershed, Lawyer; Viviana Krsticevic, Assistant; Luguely Cunillera, Assistant; Ana María Méndez, Assistant; and Héctor Dionisio, Assistant. As witnesses proposed by the Inter-American Commission: Ana María Contreras; Matilde Reyna Morales García; Bruce Harris; Rosa Angélica Vega; Julia Griselda Ramírez López; Osbelí Arcadio Joaquín Tema; Delfino Hernández García; Roberto Marroquín Urbina; and Ayende Anselmo Ardiano Paz. As expert witnesses proposed by the Inter-American Commission: