Aroldis Chapman's GF -- Police Photos of Alleged Choking Aftermath

These photos of Aroldis Chapman's GF are now at the center of a domestic violence investigation -- showing her neck and chest after the MLB star allegedly choked her.

Prosecutors in Broward County, Florida have requested the police photos -- obtained by TMZ Sports -- which could become the centerpiece of a criminal case.

As we previously reported, Chapman's girlfriend told police he attacked her back in October -- choking and pushing her -- after she got suspicious about something on his cell phone.

In fact, here's what she told police:

"He came to the bathroom and took his phone from me and then I went and I follow him to the bar to confront her about it, but there were friends there so we went to the movie theater to talk about it. But, he was like - he was drinking, you know?"

"So he was mad. So, he was really like - aggravated and I got really - I got real scared. He pushed me against the wall. My brother came in. He broke us down. We were arguing and fighting together, whatever, And that's when I left and started running and I was really - I was scared for me and my daughter."

The 22-year-old woman claimed Chapman then went to the garage of his home and fired 8 gunshots by himself. No one was injured.

Cops were called to the scene -- but say they saw no evidence of injuries or even redness anywhere around her neck and chest.

In fact, the woman signed an affidavit that night saying she did not want to press charges against Chapman.

Chapman has not been charged with a crime so far -- but we know prosecutors are currently looking into the case.