Even in divorce, Denise Richards can't get away from the mayhem Charlie Sheen leaves in his drunken wake.

Because the actor's ex-wife was actually present at dinner on the night Sheen allegedly went ballistic and eventually threatened the life of Capri Anderson - the porn star has said Richards left when she saw the evening turning into a night of "floozies" - police have contacted the actress.

Richards was also sleeping in the Plaza Hotel room across from her ex when cops arrived on the scene. She reportedly entered at some point and could have spotted evidence to be used in an investigation.

Sources tell TMZ Denise plans to "fully cooperate."

Meanwhile, a police spokesman spoke to E! News and gave some background on just what the NYPD is looking into, based on charges Anderson has brought against her one-time date.

"She decided a month later the crime that was completed was harassment," the spokesman said. "She said he was shouting at her, knocking things off in the hotel room, acting irrational. She voluntarily locked herself in the bathroom and was not held against her will. She was not a victim of assault. She was not imprisoned in the hotel room."

Why didn't police initially investigate the events?

"When we responded, she didn't file a police report. She never said she felt in danger. Mr. Sheen voluntarily went to the hospital were he underwent a psychiatric evaluation."

Cops will also speak to Sheen about the incident at some point over the next couple days.

Perhaps an English teacher could do the same. This crazy dude needs serious grammar help!