The MTA’s top cop is calling it quits. Owen Monaghan, who has headed the agency’s police department since 2017, sent a message to colleagues on Monday announcing that he will retire on Jan. 5.

Retiring police Chief Joseph Esposito considers 9/11 the low point of his tenure, but he turned it around. “We’ve thwarted a good number of attacks,” he said.

The MTA's police chief is stepping down on January 5. Owen Monaghan will retire after leading the agency's police department since 2017. He served 34 years with the NYPD before that.

After more than 40 years on the force, NYPD Chief Joseph Esposito is retiring. At age 63, his retirement is mandatory, but Esposito says he would stay in the job if he could.

Chief Joseph Esposito, right, listens as Police Commissioner Ray Kelly discusses the Times Square car bomb incident in 2010. Esposito is retiring Wednesday after more than 40 years.

The NYPD’s former top-ranked uniformed officer admitted Tuesday that the number of stop-and-frisks jumped by an astounding 700% on his watch. But retired Chief of Department Joseph Esposito a… ...