A fourth suspect has been arraigned for his alleged involvement in the murder of a Gilroy man. 56-year-old Robert Joseph Heiser was found dead at his home on Bay Tree Drive last month. The first two suspects, 19-year-old Gabriela Bernice Ortiz and 22-year-old Rodrigo Bejarano, are in custody. Gerardo Cisneros appeared in court yesterday and did not enter a plea. The third suspect, 17-year-old Isabella Chaidez, is still at large. Anyone with information is urged to contact Gilroy police.