Boston Police Superintendent-in-Chief William Gross was named the city’s new police commissioner on Monday, replacing William Evans, who is leaving for a new job heading up the Boston College police force.

“Chief Gross is a proven leader who is trusted and respected in the community,” Mayor Marty Walsh said in announcing the appointment.

Gross has been with the department for 33 years, including the last 5-1/2 as its chief. He also served as the department’s night commander, led the city’s