The Brief Two men died this week following separate incidents stemming from their time in custody at the Tarrant County jail. The two inmates had refused medical exams before suffering medical emergencies. A third man, Mack Greer, remains on life support after suffering a head injury in jail, according to his family. Two men died after suffering separate medical emergencies at the Tarrant County jail this week. A third remains on life support after suffering a head injury while in custody. First In-Custody Death What we know: The first inmate was a 40-year-old male who has not yet been identified. On Monday, his cellmate noticed he was in distress and alerted jail staff, according to a Tarrant County Sheriff's Office spokesperson. Jail personnel gave him life-saving measures, which were continued by medical staff at John Peter Smith (JPS) Hospital. The man was pronounced dead at the hospital. Dig deeper: According to sheriff's officials, the man was taken into custody on Sunday by the River Oaks Police Department for allegedly violating a bond or protective order. He reportedly refused to cooperate or consent to a routine medical assessment during his initial jail intake. Jail personnel cannot force an individual to provide medical history or comply with a medical evaluation, officials said in a statement. Second In-Custody Death What we know: The second inmate was also a 40-year-old male who has not yet been identified. On Tuesday, a detention officer found him kneeling beside his bed and failing to respond to greetings. He was also given life-saving measures and taken to JPS Hospital, where he was later pronounced dead. Dig deeper: The second man was also taken into custody on Sunday, but in Fort Worth. Fort Worth police charged him with possession of less than 2 ounces of marijuana. He also refused to cooperate or consent to a medical assessment. Third Man's Injuries Questioned What we know: According to Tarrant County Commissioner Alisa Simmons, Mack Greer sustained a fatal head injury while in custody at the Tarrant County jail and was #fox4news #crimewatchdallas