Answer based on context:

The Ravens began their 2007 campaign on the road against their AFC North foe, the Cincinnati Bengals, in the first game of a Monday Night Football doubleheader.  In the first quarter, Baltimore lost two fumbles early on, with the Bengals turning the second fumble into QB Carson Palmer's 39-yard TD pass to WR Chad Johnson.  Later, another Raven fumble allowed Cincinnati to cash in as Bengals kicker Shayne Graham nailed a 23-yard field goal.  In the second quarter, Baltimore finally managed to get on the board as RB Musa Smith got a 6-yard TD run.  Later, Cincinnati increased its advantage with Graham kicking a 40-yard field goal.  The Ravens would end the half with kicker Matt Stover getting a 36-yard field goal. In the third quarter, Baltimore's turnover problems continued as QB Steve McNair fumbled the ball as he got sacked, allowing Bengals LB Landon Johnson to return the fumble 34 yards for a touchdown for the only score of the period.  In the fourth quarter, the Ravens finally took the lead with Stover kicking a 23-yard field goal and Safety Ed Reed returning a punt 63 yards for a touchdown.  However, later in the period, a McNair pass would end up intercepted by DE Robert Geathers.  The Bengals would quickly cash in as Palmer would complete a 7-yard TD pass to WR T. J. Houshmandzadeh, followed by a 2-point conversion run by RB Rudi Johnson.  With McNair having groin problems, QB Kyle Boller would take over.  He threw a pass in the red zone to tight end Todd Heap that was overturned for an offensive pass interference penalty - a call that drew anger from Ravens fans as replays showed that if anything, Heap had been interfered against. Near the end of the game, he almost helped the Ravens score, but a Michael Myers interception ended any hope of Baltimore's comeback.  In the end, the Ravens would end up with 6 total turnovers on the night. With the loss, Baltimore began its season at 0-1 while the Bengals started out 1-0. Q1 - CIN - 8:38 - 39-yard TD pass from Carson Palmer to Chad Johnson (kick blocked) (CIN 6-0) Q1 - CIN - 4:07 - Shayne Graham 23-yard FG (CIN 9-0) Q2 - BAL - 11:56 - Musa Smith 6-yard TD run (Matt Stover kick) (CIN 9-7) Q2 - CIN - 1:07 - Shayne Graham 40-yard FG (CIN 12-7) Q2 - BAL - 0:06 - Matt Stover 36-yard FG (CIN 12-10) Q3 - CIN - 8:57 - Landon Johnson 34-yard fumble return TD (Graham kick) (CIN 19-10) Q4 - BAL - 14:05 - Matt Stover 23-yard FG (CIN 19-13) Q4 - BAL - 12:25 - Ed Reed 63-yard punt return TD (Stover kick) (BAL 20-19) Q4 - CIN - 8:53 - 7-yard TD pass from Carson Palmer to T. J. Houshmandzadeh (Rudi Johnson 2-point conversion run) (CIN 27-20)

Who scored the longest touchdown in the fourth quarter?
Ed Reed