There are 3 things on this link that really brings my Hinky Meter way up.
http://www.crimelibrary.com/news/original/0207/0503_roxanne_paltauf2.html
1 The clothes he (the boyfriend) gave me a few days later were not my daughter's. Neither her sisters nor I had ever seen them before.
2 According to Jennifer, she never answered calls from her ex-boyfriend on the day Roxanne disappeared; however, cell phone records paint a different picture. Between July 8, 2006 and July 9, 2006, there were 22 calls placed from Roxanne's cell phone to Jennifer's cell phone, ranging from 1 to 49 minutes in length. For someone who had nothing to say, she took long enough not to say it.
3This one tells me Walls is capable of doing this.
"One time, Roxanne and her boyfriend were down on 6th street. It is like a bar street here in Austin, where they do like Mardi Gras type stuff. She said that she and Lewis (the boyfriend) were down there one evening and that Lewis got into a confrontation with a Hispanic guy. Roxanne supposedly tried to stop the fight, and she was pushed and her nose was broken. It was actually completely detached. This is the story she told me, but after she come up missing, her friends told me that she said a certain someone else broke her nose and that she was covering up for him."