Answer based on context:

The Chargers began their season at Arrowhead Stadium for a division rivalry match against the Kansas City Chiefs. In the first quarter the Chargers took the early lead as QB Philip Rivers completed a 3-yard TD pass to TE Antonio Gates. The Chiefs replied when RB Jamaal Charles made a 56-yard TD run. In the 2nd quarter the Chargers fell behind when QB Matt Cassel completed a 2-yard TD pass to TE Tony Moeaki. This was followed by WR Dexter McCluster returning a punt 94yards to the endzone for a touchdown. In the third quarter the Chargers cut the lead when QB Philip Rivers threw a 59-yard TD pass to WR Legedu Naanee. In the 4th quarter the Chiefs defense prevented any more scoring from the Chargers.

How many points did the Chargers score in the 4th quarter?
0