Allen Ray Andrade was arrested early Wednesday morning in Thonton, Colorado for the murder of (Angie Zapata) Justin Zapata, 18.

Angie Zapata, a transgender woman from Greeley was apparently killed earlier this month because a man she was dating discovered she was actually a man.

The suspect, Allen Ray Andrade, 32, was arrested after police answered a loud noise complaint and discovered Zapata's car.

Authorities have released few details about the case. They will not say whether the apartment had been broken into. They also have not said whether any items -- besides Zapata's car -- were missing from the scene.

In an affidavit, Andrade explains that he started to look at photos in the apartment and questioned Zapata's sex on . That night, he questioned Zapata directly, and according to the affidavit, Zapata responded, "I'm all woman."

Andrade told authorities that he grabbed Zapata by the genitals and discovered a penis. He became angry and struck Zapata with his fist before grabbing a fire extinguisher and striking her in the head twice, according to the affidavit.

Andrade explains to police that he believed he "killed it," referring to Zapata but when she was making gurgling noises and when she began to sit up, he hit her with the extinguisher yet again.

He also admitted to authorities that he stole Zapata's car and fled the scene.