Read the following context and answer the question.
Context: The team lost veteran safety Madieu Williams to free agency in the offseason and while he under performed last year , he was still a productive player and a solid starter . Set to replace Williams is Marvin White , a 2007 fourth round pick who lacks experience and top end speed . But he made plenty of plays collegially at TCU and the team hopes that playmaking ability will transfer to the NFL .
Question: What might be the reason the team lost Madieu Williams ?
Answer:


Madieu Williams may have wanted a new contract but they could n't agree on terms .