New details about the troubled past of Matthew Baier have just been revealed. Following a number of claims regarding the Teen Mom OG star's allegedly secret children, a source claims Amber Portwood's fiance may be withholding even more information from fans, and possibly, from her.

'Teen Mom OG' Amber Portwood & Fiance Split After He's Caught Insulting Her Co-Star?

According to a new report, Baier was accused of sexually assaulting a woman in a 2014 restraining order, and just six months later, the unnamed victim was found dead.

"[She] committed suicide in November 2014," her mother confirmed to Radar Online on Monday.

'Teen Mom 2' Kailyn Lowry Speaks After Harsh Tweets From Amber Portwood's Fiance

The woman was said to be “frightened” of Baier after the alleged incident, and according to her mother, she broke things off with Baier after discovering he had told her “all kinds of lies” in addition to his alleged sexual assault.

“She did some research on him, and found out a lot of what he told her wasn’t true. She left, and filed a restraining order to protect herself,” her mother revealed.

Then, in November of that same year, the young mother passed away.

A source close to Baier claimed he never assaulted the woman.

“He did not keep in touch with her, and did not know she had passed away,” the source told Radar.

For more of Amber Portwood and Matthew Baier, tune into the second half of the Teen Mom OG reunion, airing on Monday, March 7, at 10 p.m.

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