BOSTON (CBS/AP) — Police Commissioner Ed Davis, a key figure in the investigation of the Boston Marathon bombing, was spending his final day on the job Friday after seven years in the post.

Davis, 57, announced plans in September to step down as his boss, longtime Mayor Thomas Menino, was preparing to retire at the end of the year.

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WBZ NewsRadio 1030’s Karen Twomey reports

He told WBZ NewsRadio 1030 that his proudest accomplishment is the statistical reduction in violent crime and an emphasis on community policing.

“This is the best community police department in the nation. You can improve on everything, but this is not something that’s a problem here in the city. We have an enormous and strong connection with our citizens,” Davis said.

One of Davis’ final tasks was ensuring police kept under control the fan celebrations that followed the Red Sox’s World Series victory this week at Fenway Park. About 10 people were arrested but few serious problems reported.

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Superintendent-in-Chief Daniel Linskey will oversee security and crowd control during Saturday’s duck boat parade honoring the Red Sox. Davis said he was confident police would do a good job.

Davis twice testified before congressional panels in the aftermath of the April 15 attack that killed three people and wounded more than 260 others at the marathon finish line. He called for better information-sharing between federal agencies and local departments about potential terrorist threats.

Davis said he had not ruled out leading another big-city department sometime in the future. For now, he has accepted a fellowship at the John F. Kennedy School of Government at Harvard University.

His replacement will be chosen by the city’s next mayor. City Councilor John Connolly and state Rep. Martin Walsh square off Tuesday in the mayoral election, with the winner taking office in January.

(TM and © Copyright 2013 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2013 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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