CHICAGO (WLS) -- A third investigation has been opened into a Chicago police officer tied to the death of Officer Krystal Rivera .

The officer in question was Rivera's partner. Investigators say he accidentally shot and killed her in the line of duty this year.

He's also now under investigation for an alleged attack on an off-duty officer at a bar over the weekend.

The same officer is now accused of trying to gather any video evidence of that attack.

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The Chicago Police Department said Thursday it's investigating one of its own officers for possibly meddling in an investigation about an alleged attack he's accused of instigating on a Wicker Park sidewalk Sunday night.

A number of surveillance cameras keeping watch over a bus

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