On January 10, Omar was taken to Medical Center Hospital, after he became unresponsive. He was then transported to Cook's Children's Hospital in Fort Worth, where he died the next day.
An autopsy showed Omar died from blunt force trauma in the abdomen and the medical examiner ruled his death a homicide.
Flash forward to Wednesday, when an arrest warrant was issued for Olivas and Ramirez. They were taken into custody around 2 p.m. They have both been charged with capital murder.
NewsWest 9 went to Omar's father's house. He said he had just found out about the arrests. He did not want to speak to NewsWest 9 on camera, but he did say if they had anything to do with it, the truth will come out and they will get what's coming to them.
Child Protective Services told NewsWest 9 they investigated reports of abuse, involving Frias, last year. They also said Omar's four month old little brother was placed in foster care last week.
No bond has been set for either Olivas or Ramirez.