Dirk Nowitzki has filed for sole custody of the child that might not be his, while his ex-girlfriend is under FBI investigation for threatening his attorney from jail. It's all one big ball of crazy. FBI agents in Texas have seized recordings of threatening jailhouse phone calls made by Crista Ann Taylor, the ex-girlfriend of Dallas Mavericks All-Star forward Dirk Nowitzki, to the player's attorney, two sources with knowledge of the investigation said. [...] Taylor's prison phone ...