$250 for helping the criminal
You will find Officer Lewis chasing a criminal up the hill. You can either help the officer, for nothing or help the criminal for $250.
You can help the criminal by stunning or killing the Officer. This will get you a 3 Star Wanted Level but the perp will give you $250 before running away.
If you help the officer by gunning down the perp, you will incur a 2 Star Wanted Level. It is better to run the perp over to avoid the Wanted Levels.
The third option is to just watch things play out and not get involved.