There is no set protocol for how a homicide detective conducts his/her investigation contained in the NYPD manual to my knowledge. There is definitely no lawsuit that can be brought over a negligent or incomplete investigation by the police department either.
The answers given are informational only and do not constitute legal advice. Please feel free to contact me if you want to obtain legal advice from me.
This query was posted under the wrongful death heading. No claim for wrongful death will stand against the police under the circumstances presented and while there may be certain protocols applicable to all police investigations, the decision to question any particular person is going to be made on a case by case basis. That being said, if you believe some individual or entity is, in fact, responsible for the death you are referring to and you are someone with the proper standing to assert such a claim, you should consult with an attorney as soon as possible.
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If you have information that needs to be shared with the police, it is important to do so as soon as possible. It is hard to know whether the girlfriend should have been questioned without further information. I hope this helps.
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