How to get rid of dead person smell?

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I'm working with a landlord whose last tenant killed himself in the unit and was not discovered for two weeks in the middle of summer. The landlord hired ServPro to "clean up" the place but the smell still lingers. He got it repainted and it helped a little but the smell is still there. What's a good way to remove the odor for good? Can't rent the unit until this is resolved. Any ideas or suggestions would be very much appreciated!