According to a news release from the Wyoming Department of Public Safety, the department obtained an arrest warrant charging Andrew Hudson with open murder.

Hudson is 35-year-old Ana Carrillo's ex-boyfriend. Carrillo was last seen Sunday morning, Sept. 3.

38-year old Andrew Hudson is already accused of interfering with a police investigation. Thursday afternoon prosecutors added an open murder charge.

Police believe Hudson is the person who killed ex-girlfriend Ana Carrillo. She is also the mother of his three children.

"It is a nightmare we can not come out of," said Melinda Gomez, Ana Carrillo's sister.

Gomez says police informed family members the investigation turn to a murder investigation after police found blood evidence.

Ana's blood was located in Hudson's truck and at his home. And there's evidence Hudson attempted to hide the blood.

"I just miss her so much and I with I had her here again," said Birdie Gomez, mother of Ana Carrillo."We are devastated, words can not explain how our family is doing right now," said Gomez.

Court documents also say the day Carrillo went missing police found items of clothing burning in a burn barrel at Hudson's home. And buttons that MAY belong to the jacket Carrillo was wearing the day she was last seen.

"Anybody, if you know anything, his family even if it is a little bit, Bring my sister home so we can burry her properly," said Gomez.
Authorities in West Michigan have been extensively investigating Carrillo's disappearance. Wyoming DPS says evidence gathered from the investigation will show Hudson is responsible for her disappearance and murder.

Hudson was arraigned on the murder charge Thursday afternoon. If convicted he would face a life sentence in prison.

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April Stevens is a multi-platform producer at WZZM 13. Have a news tip? Email, visit our Facebook page or Twitter.