"He had asked for my daughter and I said, she wasn't here right now and I said can I take a message and he said tell her I'm going to kill her," says Karen Coplein.

This phone call is just one of hundreds made to several women in the Janesville area. And Karen Coplein's 16 year old daughter is just one of them.

"The first time was horrendous. It was my daughters and it was just terrible. It was non-stop. It was like for 3 or 4 days we had to change her phone number, her cell phone number."

Police have received reports since January from women claiming to have received calls and text messages from an unknown caller saying things like "This is the text message killer" I'm going to "kill your daughter" and I'm "On my way" "I'm going to break your windows."

"When you intimidate someone over the telephone or in person and you do it continuously and repeatedly, it meets the elements of a stalking charge," says Janesville Police Lieutenant, Keith Lawver.

Janesville Police traced the calls to the home of 36 year old Tracy Wolf. He's been arrested 11 times for making this type of call already this year and charged with stalking in most cases.

Making those phone calls has found Tracy Wolf in the Rock County Jail, a place where authorities say he could spend some serious time if convicted of this felony.

"He's admitted that he's making these phone calls and that he has a difficult time stopping," says Lawver

Karen and her daughter are now trying to put this incident behind them and hope justice will be served.

"We just wish it to be stopped. She needs to be a 16 year old and I am more afraid for her than I am myself," says Coplein.