DETROIT — For the second time in two years, a Detroit police chief is embroiled in a sex scandal.

Detroit Mayor Dave Bing suspended Ralph Godbee Tuesday from his $140,400-a-year job amid allegations that the married chief of police had a sexual relationship with a subordinate.

Godbee, 44, and Angelica Robinson, 37, an internal affairs officer, had been conducting an affair that she said had run its course, according to her attorney, David Robinson.

‘‘There was a sexual relationship between my client and Godbee,’’ David Robinson said. ‘‘She was trying to end the relationship, and Godbee didn’t want to let it go.’’

Bing fired Godbee’s predecessor, Warren Evans, in 2010, partly because he was romantically involved with a female officer.

In the more recent case, Angelica Robinson posted a photo of herself with her service weapon in her mouth on the social media site Twitter after learning Godbee was at a weekend police conference with another woman, David Robinson said. He said Godbee had other officers locate Angelica Robinson and put her under surveillance.

‘‘Obviously, it raised the implication of suicide,’’ David Robinson said. ‘‘The story is that she was hurt he was at a conference with another woman. Certainly this has created a lot of pressure. Unfairly, her future is a little bit uncertain. She has to suffer the humiliation.’’

Angelica Robinson has been reassigned from internal affairs to other duties.