The Glen Ellyn Police Department issued an arrest warrant for the ex-husband of Nancy Bustos, the woman found murdered in her Glen Ellyn apartment on Oct. 16. 

Just days before she was killed, her ex-husband Juan Granados called threatening her to "stay with him," according to the records.

The document alleges Granados "communicated a threat, by telephone, to inflict...physical harm" upon Bustos during a phone call on Oct. 10. 

The $500,000 warrant has no geographic limits, so police anywhere can arrest Granados. Police believe Granados was the last person to see Bustos alive but they've been unable to locate him. 

"We still believe that he is in Mexico," said Glen Ellyn Deputy Police Chief Bill Holmer. The department is working with federal authorities to try and locate Granados. He was last seen driving a black, 1992 BMW, 325i with four doors and Illinois license plate L655003. Holmer said there's a possibility he is with family in Mexico. 

Even though the department issued the warrant, they will not name Granados as a suspect at this time. Holmer said he is still a "person of interest." 

"It's because we want to have a solid amount of evidence instead of just background story," said Holmer. 

Bustos and Granados have a history of an abusive relationship, which is detailed in court documents and anecdotes from a previous neighbor. 

Patch previously reported:

Lois Tranby lived across the hall from Bustos, Granados and their daughter in Glendale Heights back in the early 2000s.   

Their relationship “didn’t seem like the nicest arrangement,” said Tranby.

Tranby does not recall hearing any physical violence and doesn’t remember seeing any bruises on Bustos. But she does remember hearing verbal disputes, though she says they didn’t last long. On multiple occasions, Tranby said the police showed up at Bustos' because of those arguments. 

Court documents show that during the time Bustos and her family were living across the hall from Tranby, in September 2004, two Glendale Heights officers responded to a domestic disturbance. The file states, Granados “struck Nancy C. Bustos in the face with his elbow and grabbed her right forearm with his hand.” 

After the incident Bustos filed for an emergency order of protection, in which she said her “daughter saw the whole incident.” Bustos also noted that “he got violent like always,” and apparently threatened to take their daughter to Mexico.