FORT WORTH, Texas — The attorneys for the former Fort Worth police officer who shot and killed Atatiana Jefferson filed a motion Monday seeking to delay Aaron Dean’s trial once again due to the poor health of his lead attorney. The murder trial for Dean is scheduled to begin May 16, with jury selection starting May 9, and has already been delayed multiple times. However, attorneys Bob Gill and Miles Brissette asked the court to delay the trial again because Dean’s lead attorney, Jim Lane, is seriously ill. The motion was filed Monday as the court began hearing arguments on a separate motion fr…