Milwaukee County Sheriff David Clarke attends wake of New York officer, Wenjian Liu

NEW YORK (WITI) -- Milwaukee County Sheriff David Clarke was in New York attending a wake for New York Police Detective Wenjian Liu.

Liu is one of the two police officers ambushed and gunned down two weeks ago in their squad car in Brooklyn. His partner, Rafael Ramos, was laid to rest last week.

It was during that service that some police officers turned their backs on Mayor Bill de Blasio -- as a silent symbol of anger and frustration toward the mayor's handling of the recent community tensions with the police.

The Police Commissioner has asked officers to show respect at Liu's funeral which is tomorrow, Sunday, January 4th.

Clarked tweeted this picture out earlier today -- calling Liu one of New York Police Department's finest.