11.   Aetna Inc. said it chose Daniel J. Messina to replace the chief financial officer of its healthcare unit whose abrupt departure last month sparked concern among investors.

12.   After her abrupt departure, she had doubts about working again.

13.   All of this in the wake of the abrupt departure of Mark Rose, whom he hired as hopeful successor.

14.   For that reason, Karl represented some stability while Walker picked up the pieces that were left from the abrupt departure of former president Bob Whitsitt.

15.   He made an abrupt departure on Tuesday as well, but he did not need to.

16.   He said he wanted to absolve the station of responsibility for his abrupt departure.

17.   He made an abrupt departure today as well, but he did not need to.

18.   His abrupt departure, less than three years into the job and three months after launching a plan to transform UMass, has left trustees scrambling to ensure continuity.

19.   Instead, investors were jarred by declining sales and earnings, three profit warnings and the abrupt departure in January of John L. Zabriskie, its chief executive.

20.   Now some say the differences in corporate culture may have contributed to his abrupt departure.