Ralph Ostrowski is a bail jumper in Grand Theft Auto V. He is located in Davis Quartz (just southeast of Sandy Shores). Ralph will be alone, but might attempt to flee in a truck if not stopped before. He can be easily brought down with a Stun Gun. If he does try to escape in a vehicle, shooting two tires makes him surrender.
I got this tip-off this particular reprobate has been hiding out at the quarry. Slippery character by all accounts so you might have a runner on your hands.